List of Roman-to-modern scheduled monuments in Gwynedd

Gwynedd is a large rural county in North Wales. The northern half includes the high mountains of Snowdonia and the mixed farmland and hills of the Lleyn peninsula, which between them make up the former county of Caernarvonshire. The southern part of Gwynedd is the softer coastal and upland landscapes of the former county of Merionethshire. Gwynedd, the second largest county in Wales, has a total of 497 Scheduled monuments. That is too many to have on a single list article, so for convenience the list is divided into three. The 365 prehistoric sites are in two lists, covering 171 sites in former Merionethshire, and 194 sites in former Caernarvonshire. Below are the 132 sites dating from Roman to modern times, from the whole of Gwynedd. Gwynedd is a unitary authority comprising most of two historic counties. In 1974 it also merged with Anglesey, and the merged county was also called Gwynedd. Since 1996 Anglesey has been a separate county again.

There are 16 Roman scheduled sites on the list, almost all of which relate either to Roman military activity, or local defensive measures. By contrast, the 14 early medieval (Dark Age) monuments are all individual stones, either with carved crosses or other inscriptions or in one case a sundial. The 53 post-Norman medieval sites include sites included in the Castles and Town Walls of King Edward in Gwynedd World Heritage Site. Seven castles, 11 mottes, and seven enclosures are scheduled, as well as deserted settlements, two abbeys, five chapels and two holy wells. The 49 post-medieval sites include ten bridges, various sites relating to quarries, mines, engine houses, and railways, and five World War II defences.

The northern prehistoric sites are listed at List of prehistoric scheduled monuments in Gwynedd (former Caernarvonshire)

The southern prehistoric sites are listed at List of prehistoric scheduled monuments in Gwynedd (former Merionethshire)

Scheduled monuments have statutory protection. It is illegal to disturb the ground surface or any standing remains. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales.^[1] The list of scheduled monuments below is supplied by Cadw^[2] with additional material from RCAHMW and Gwynedd Archaeological Trust.

Image	Name	Site type	Community	Location	Details	Historic County	Period	SAM No & Refs
	Enclosure & Settlement 400m East of Cyfannedd Fawr	Hut circle settlement	Arthog	52°41′25″N 4°01′20″W / 52.6904°N 4.0223°W / 52.6904; -4.0223 (Enclosure & Settlement 400m East of Cyfannedd Fawr), SH634122		Merionethshire	2Roman	ME086 [3]
	Round Hut and Cairns on NW Slope of Braich Ddu	Ring cairn	Arthog	52°41′23″N 4°01′15″W / 52.6896°N 4.0208°W / 52.6896; -4.0208 (Round Hut and Cairns on NW Slope of Braich Ddu), SH635121		Merionethshire	2Roman	ME100 [4]
	Pier Camp	Earthwork	Bangor	53°14′02″N 4°07′39″W / 53.2339°N 4.1276°W / 53.2339; -4.1276 (Pier Camp), SH581729	Strongly defensible earthworth hillfort. A 4th century Roman coin found on the site.	Caernarvonshire	2Unknown	CN073 [5]
	Dinas Emrys Camp	Hillfort	Beddgelert	53°01′20″N 4°04′44″W / 53.0222°N 4.0788°W / 53.0222; -4.0788 (Dinas Emrys Camp), SH606492	Hilltop fort which tradition links with Vortigern and Merlin. Iron Age, Roman and Dark Age evidence has all been found. Present stonework probably, medieval.	Caernarvonshire	2Roman	CN018 [6]
	Brithdir Roman Fort	Roman fort	Brithdir and Llanfachreth	52°45′13″N 3°49′15″W / 52.7535°N 3.8209°W / 52.7535; -3.8209 (Brithdir Roman Fort), SH772188	Roman fortlet which may also have had its own settlement. Now on the edge of the village if Brithdir.	Merionethshire	2Roman	ME080 [7]
	Segontium Roman Fort	Roman fort	Caernarfon	53°08′14″N 4°15′58″W / 53.1372°N 4.2662°W / 53.1372; -4.2662 (Segontium Roman Site), SH485624	Regiment garrisoned here from 77AD to 394AD, a uniquely long occupation within Wales. It was the administrative centre for NW Wales throughout this period. Excavated buildings on view.	Caernarvonshire	2Roman	CN006 [8]
	Lower Roman Fort	Roman fort	Caernarfon	53°08′12″N 4°16′13″W / 53.1367°N 4.2702°W / 53.1367; -4.2702 (Lower Roman Fort), SH482623		Caernarvonshire	2Roman	CN094 [9]
	Bryn-Glas Roman Signal Station	Signal station	Caernarfon	53°08′50″N 4°14′24″W / 53.1473°N 4.2401°W / 53.1473; -4.2401 (Bryn-Glas Roman Signal Station), SH502634		Caernarvonshire	2Roman	CN188 [10]
	Llanfor Roman Fort and Camps	Roman fort	Llandderfel	52°54′45″N 3°34′55″W / 52.9124°N 3.582°W / 52.9124; -3.582 (Llanfor Roman Fort and Camps (revealed by Aerial Photography)), SH937361	(revealed by Aerial Photography)	Merionethshire	2Roman	ME092 [11]
	Caer Gai Roman Site	Roman fort	Llanuwchllyn	52°52′08″N 3°40′07″W / 52.8688°N 3.6686°W / 52.8688; -3.6686 (Caer Gai Roman Site), SH877314		Merionethshire	2Roman	ME018 [12]
	Dinas y Prif Camp	Enclosure	Llanwnda	53°05′42″N 4°17′46″W / 53.0949°N 4.2961°W / 53.0949; -4.2961 (Dinas y Prif Camp), SH463577		Caernarvonshire	2Roman	CN030 [13]
	Castell Tomen y Mur	Amphitheatre	Maentwrog	52°55′48″N 3°55′30″W / 52.9299°N 3.925°W / 52.9299; -3.925 (Castell Tomen y Mur), SH705386		Merionethshire	2Roman	ME002 [14]
	Tomen y Mur	Roman fort	Maentwrog	52°55′39″N 3°55′17″W / 52.9276°N 3.9214°W / 52.9276; -3.9214 (Tomen y Mur), SH709384		Merionethshire	2Roman	ME078 [15]
	Cefn-Caer Roman Site	Roman fort	Pennal	52°35′00″N 3°54′45″W / 52.5832°N 3.9125°W / 52.5832; -3.9125 (Cefn-Caer Roman Site), SH705000		Merionethshire	2Roman	ME009 [16]
	Roman Bath-House, Tremadoc	Bath-house	Porthmadog	52°56′21″N 4°08′54″W / 52.9392°N 4.1482°W / 52.9392; -4.1482 (Roman Bath-House, Tremadoc), SH557401		Caernarvonshire	2Roman	CN174 [17]
	Roman Kilns 225m SE of Pen-y-Stryd	Kiln	Trawsfynydd	52°52′11″N 3°53′30″W / 52.8697°N 3.8918°W / 52.8697; -3.8918 (Roman Kilns 225m SE of Pen-y-Stryd), SH727319		Merionethshire	2Roman	ME071 [18]
	Dol-ddinas Roman Earthworks	Practice camp	Trawsfynydd	52°55′27″N 3°53′01″W / 52.9241°N 3.8836°W / 52.9241; -3.8836 (Dol-ddinas Roman Earthworks), SH734379		Merionethshire	2Roman	ME077 [19]
	Roman Practice Camp 440m WSW of Braich-ddu	Practice camp	Trawsfynydd	52°55′39″N 3°54′39″W / 52.9274°N 3.9109°W / 52.9274; -3.9109 (Roman Practice Camp 440m WSW of Braich-ddu), SH716383		Merionethshire	2Roman	ME260 [20]
	Roman Practice Camps 190m W of Llyn Hiraethlyn	Practice camp	Trawsfynydd	52°54′51″N 3°52′24″W / 52.9141°N 3.8733°W / 52.9141; -3.8733 (Roman Practice Camps 190m W of Llyn Hiraethlyn), SH741368		Merionethshire	2Roman	ME261 [21]
	Roman Road Extending SE 650m from Llyn Hiraethlyn toward Glasgoed	Roman Road	Trawsfynydd	52°54′49″N 3°52′06″W / 52.9135°N 3.8683°W / 52.9135; -3.8683 (Roman Road Extending SE 650m from Llyn Hiraethlyn toward Glasgoed), SH743368		Merionethshire	2Roman	ME262 [22]
	The Senacus Stone (formerly in Tudweiliog, Dwyfer)	Inscribed stone	Aberdaron	52°48′14″N 4°42′41″W / 52.8039°N 4.7113°W / 52.8039; -4.7113 (The Senacus Stone (formerly in Tudweiliog, Dwyfer)), SH173263		Caernarvonshire	3Early Medieval	CN089 [23]
	The Veracius Stone (formerly in Tudweiliog, Dwyfer)	Inscribed stone	Aberdaron	52°48′14″N 4°42′41″W / 52.8039°N 4.7113°W / 52.8039; -4.7113 (The Veracius Stone (formerly in Tudweiliog, Dwyfer)), SH173263		Caernarvonshire	3Early Medieval	CN090 [24]
	Cross-Inscribed Stone in the Chapel, Bardsey Island	Cross-marked stone	Aberdaron	52°45′51″N 4°47′12″W / 52.7641°N 4.7868°W / 52.7641; -4.7868 (Cross-Inscribed Stone in the Chapel, Bardsey Island), SH120221		Caernarvonshire	3Early Medieval	CN141 [25]
	Inscribed Stone in the Chapel, Bardsey Island	Inscribed stone	Aberdaron	52°45′51″N 4°47′12″W / 52.7641°N 4.7868°W / 52.7641; -4.7868 (Inscribed Stone in the Chapel, Bardsey Island), SH120221		Caernarvonshire	3Early Medieval	CN142 [26]
	Sundial in Clynnog Fawr Churchyard	Sundial	Clynnog	53°01′15″N 4°21′56″W / 53.0208°N 4.3656°W / 53.0208; -4.3656 (Sundial in Clynnog Fawr Churchyard), SH414496		Caernarvonshire	3Early Medieval	CN062 [27]
	Cross Inscribed Stone Near Capel Uchaf	Cross-marked stone	Clynnog	53°01′23″N 4°20′30″W / 53.023°N 4.3417°W / 53.023; -4.3417 (Cross Inscribed Stone Near Capel Uchaf), SH430498		Caernarvonshire	3Early Medieval	CN213 [28]
	Gesail Gyfarch Inscribed Stone	Inscribed stone	Dolbenmaen	52°57′10″N 4°10′29″W / 52.9528°N 4.1746°W / 52.9528; -4.1746 (Gesail Gyfarch Inscribed Stone), SH540417		Caernarvonshire	3Early Medieval	CN019 [29]
	Llystyn Gwyn Inscribed Stone	Inscribed stone	Dolbenmaen	52°59′08″N 4°15′45″W / 52.9855°N 4.2626°W / 52.9855; -4.2626 (Llystyn Gwyn Inscribed Stone), SH482455		Caernarvonshire	3Early Medieval	CN021 [30]
	Early Christian Inscribed Stone in the Churchyard, Llanaelhaearn	Inscribed stone	Llanaelhaearn	52°58′35″N 4°24′15″W / 52.9764°N 4.4041°W / 52.9764; -4.4041 (Early Christian Inscribed Stone in the Churchyard, Llanaelhaearn), SH386448		Caernarvonshire	3Early Medieval	CN084 [31]
	Part of Inscribed Stone Built into Wall of Churchyard	Inscribed stone	Llanaelhaearn	52°58′35″N 4°24′15″W / 52.9763°N 4.4041°W / 52.9763; -4.4041 (Part of Inscribed Stone Built into Wall of Churchyard), SH386448		Caernarvonshire	3Early Medieval	CN085 [32]
	Inscribed Stone in St Cian's Churchyard, Llangian	Inscribed stone	Llanengan	52°49′51″N 4°31′53″W / 52.8309°N 4.5314°W / 52.8309; -4.5314 (Inscribed Stone in St Cian's Churchyard, Llangian), SH295289		Caernarvonshire	3Early Medieval	CN087 [33]
	Cross-Incised Stone in Llangybi Churchyard	Cross-marked stone	Llanystumdwy	52°56′41″N 4°20′25″W / 52.9447°N 4.3402°W / 52.9447; -4.3402 (Cross-Incised Stone in Llangybi Churchyard), SH428411		Caernarvonshire	3Early Medieval	CN100 [34]
	Cross Slab Built into Farm Building Ty'n-y-Cae	Cross-marked stone	Nefyn	52°56′25″N 4°30′46″W / 52.9404°N 4.5127°W / 52.9404; -4.5127 (Cross Slab Built into Farm Building Ty'n-y-Cae), SH312410		Caernarvonshire	3Early Medieval	CN180 [35]
	Tymawr Cross-Incised Stone	Cross-marked stone	Pistyll	52°56′50″N 4°30′08″W / 52.9473°N 4.5023°W / 52.9473; -4.5023 (Tymawr Cross-Incised Stone), SH319418		Caernarvonshire	3Early Medieval	CN101 [36]
	Aber Castle Mound (Pen-y-Mwd)	Motte	Aber	53°14′02″N 4°00′50″W / 53.2338°N 4.014°W / 53.2338; -4.014 (Aber Castle Mound (Pen-y-Mwd)), SH656726		Caernarvonshire	4Medieval	CN007 [37]
	Medieval Homestead 400m SE of Maes y Gaer	Rectangular hut settlement	Aber	53°13′51″N 3°59′56″W / 53.2307°N 3.9988°W / 53.2307; -3.9988 (Medieval Homestead 400m SE of Maes y Gaer), SH666722		Caernarvonshire	4Medieval	CN137 [38]
	Enclosure & Associated Structures at Pen-y-Bryn	Enclosure	Aber	53°14′06″N 4°00′43″W / 53.235°N 4.012°W / 53.235; -4.012 (Enclosure & Associated Structures at Pen-y-Bryn), SH658727		Caernarvonshire	4Medieval	CN218 [39]
	St Mary's Abbey, Bardsey Island	Abbey	Aberdaron	52°45′51″N 4°47′16″W / 52.7643°N 4.7877°W / 52.7643; -4.7877 (St Mary's Abbey, Bardsey Island), SH120221		Caernarvonshire	4Medieval	CN068 [40]
	Site of St Merin's Church	Church	Aberdaron	52°50′59″N 4°42′51″W / 52.8498°N 4.7143°W / 52.8498; -4.7143 (Site of St Merin's Church), SH173314		Caernarvonshire	4Medieval	CN171 [41]
	Long Houses, Enclosures & Field Systems, Bardsey Island	Rectangular hut	Aberdaron	52°46′03″N 4°47′27″W / 52.7674°N 4.7908°W / 52.7674; -4.7908 (Long Houses, Enclosures & Field Systems, Bardsey Island), SH118225		Caernarvonshire	4Medieval	CN186 [42]
	Capel Anelog	Chapel	Aberdaron	52°48′47″N 4°44′16″W / 52.813°N 4.7377°W / 52.813; -4.7377 (Capel Anelog), SH155274		Caernarvonshire	4Medieval	CN220 [43]
	Long House South of Talarfor	Longhouse	Aberdaron	52°49′27″N 4°37′30″W / 52.8241°N 4.6251°W / 52.8241; -4.6251 (Long House South of Talarfor), SH232284		Caernarvonshire	4Medieval	CN318 [44]
	St Mary's Church	Church	Aberdaron	52°47′36″N 4°45′40″W / 52.7934°N 4.7612°W / 52.7934; -4.7612 (St Mary's Church), SH139253		Caernarvonshire	4Medieval	CN381 [45]
	Llys Bradwen Medieval Site	Enclosure	Arthog	52°42′20″N 3°59′57″W / 52.7055°N 3.9993°W / 52.7055; -3.9993 (Llys Bradwen Medieval Site), SH650138		Merionethshire	4Medieval	ME022 [46]
	Cyfannedd-Fach Homestead	Platform house	Arthog	52°41′44″N 4°01′33″W / 52.6955°N 4.0257°W / 52.6955; -4.0257 (Cyfannedd-Fach Homestead), SH631127		Merionethshire	4Medieval	ME101 [47]
	Tomen y Bala Castle Mound	Motte	Bala	52°54′41″N 3°35′44″W / 52.9115°N 3.5955°W / 52.9115; -3.5955 (Tomen y Bala Castle Mound), SH928360		Merionethshire	4Medieval	ME016 [48]
	Ty'n Twr	Building (Unclassified)	Bethesda	53°10′24″N 4°03′26″W / 53.1734°N 4.0571°W / 53.1734; -4.0571 (Ty'n Twr), SH626660		Caernarvonshire	4Medieval	CN219 [49]
	Hafod-y-Wern Long Hut	Rectangular hut	Betws Garmon	53°05′32″N 4°12′06″W / 53.0922°N 4.2016°W / 53.0922; -4.2016 (Hafod-y-Wern Long Hut), SH526572		Caernarvonshire	4Medieval	CN307 [50]
	Ystrad Rural Settlement	Deserted Rural Settlement	Betws Garmon	53°05′37″N 4°10′29″W / 53.0935°N 4.1746°W / 53.0935; -4.1746 (Ystrad Rural Settlement), SH544573		Caernarvonshire	4Medieval	CN316 [51]
	Cored Gwyrfai Fish Weir	Fish weir	Bontnewydd	53°07′22″N 4°18′54″W / 53.1228°N 4.3151°W / 53.1228; -4.3151 (Cored Gwyrfai Fish Weir), SH453607		Caernarvonshire	4Medieval	CN334 [52]
	Castell Cynfal, Bryn Crug	Motte	Bryn-crug	52°35′41″N 4°02′46″W / 52.5946°N 4.0462°W / 52.5946; -4.0462 (Castell Cynfal, Bryn Crug), SH615016		Merionethshire	4Medieval	ME121 [53]
	Caernarfon Town Walls	Town Wall	Caernarfon	53°08′28″N 4°16′31″W / 53.141°N 4.2754°W / 53.141; -4.2754 (Caernarfon Town Wall), SH479626		Caernarvonshire	4Medieval	CN034 [54]
	Caernarfon Castle	Castle	Caernarfon	53°08′22″N 4°16′37″W / 53.1394°N 4.277°W / 53.1394; -4.277 (Caernarfon Castle), SH477626		Caernarvonshire	4Medieval	CN079 [55]
	St Beuno's Well	Holy Well	Clynnog	53°01′08″N 4°22′01″W / 53.0188°N 4.367°W / 53.0188; -4.367 (St Beuno's Well), SH413494		Caernarvonshire	4Medieval	CN091 [56]
	Long Hut North of Cwm Farm	Rectangular hut	Clynnog	52°59′19″N 4°19′58″W / 52.9887°N 4.3327°W / 52.9887; -4.3327 (Long Hut North of Cwm Farm), SH435460		Caernarvonshire	4Medieval	CN309 [57]
	Criccieth Castle	Castle	Criccieth	52°54′58″N 4°13′57″W / 52.916°N 4.2324°W / 52.916; -4.2324 (Criccieth Castle), SH499377		Caernarvonshire	4Medieval	CN015 [58]
	Criccieth Castle, Outer Bank Defences	Castle	Criccieth	52°54′57″N 4°14′02″W / 52.9157°N 4.2338°W / 52.9157; -4.2338 (Criccieth Castle, Outer Bank Defences), SH499377		Caernarvonshire	4Medieval	CN173 [59]
	Dolbenmaen Castle Mound	Motte	Dolbenmaen	52°57′51″N 4°13′30″W / 52.9642°N 4.2251°W / 52.9642; -4.2251 (Dolbenmaen Castle Mound), SH506430		Caernarvonshire	4Medieval	CN063 [60]
	Maes Coch Deserted Rural Settlement	Rectangular hut settlement	Dolgellau	52°43′16″N 3°51′42″W / 52.721°N 3.8617°W / 52.721; -3.8617 (Maes Coch Deserted Rural Settlement), SH743153		Merionethshire	4Medieval	ME196 [61]
	Settlement & Fields Systems above Egryn Abbey	House platform	Dyffryn Ardudwy	52°45′42″N 4°04′10″W / 52.7617°N 4.0695°W / 52.7617; -4.0695 (Settlement & Fields Systems above Egryn Abbey), SH604202		Merionethshire	4Medieval	ME122 [62]
	Eithin-Fynydd Platform House Settlement	Deserted Rural Settlement	Dyffryn Ardudwy	52°46′30″N 4°04′38″W / 52.7749°N 4.0771°W / 52.7749; -4.0771 (Eithin-Fynydd Platform House Settlement), SH599217		Merionethshire	4Medieval	ME202 [63]
	Deserted Rural Settlement South of Ffridd Olchfa	Deserted Rural Settlement	Dyffryn Ardudwy	52°44′47″N 4°03′35″W / 52.7465°N 4.0598°W / 52.7465; -4.0598 (Deserted Rural Settlement South of Ffridd Olchfa), SH610185		Merionethshire	4Medieval	ME203 [64]
	Harlech Castle	Castle	Harlech	52°51′37″N 4°06′33″W / 52.8602°N 4.1091°W / 52.8602; -4.1091 (Harlech Castle), SH581312		Merionethshire	4Medieval	ME044 [65]
	Medieval Ecclesiastical Structure SE of Ty'n y Coed Cottage	Chapel	Llanbedr	52°49′35″N 4°05′18″W / 52.8265°N 4.0882°W / 52.8265; -4.0882 (Medieval Ecclesiastical Structure SE of Ty'n y Coed Cottage), SH594274		Merionethshire	4Medieval	ME249 [66]
	Dolbadarn Castle	Castle	Llanberis	53°07′00″N 4°06′51″W / 53.1166°N 4.1143°W / 53.1166; -4.1143 (Dolbadarn Castle), SH586598		Caernarvonshire	4Medieval	CN066 [67]
	Cwm Brwynog Deserted Rural Settlement	Deserted Rural Settlement	Llanberis	53°05′24″N 4°06′06″W / 53.0901°N 4.1017°W / 53.0901; -4.1017 (Cwm Brwynog Deserted Rural Settlement), SH594574		Caernarvonshire	4Medieval	CN315 [68]
	Rectangular Earthwork 110m NW of Coed Ty Mawr	Moated Site	Llanddeiniolen	53°10′31″N 4°09′46″W / 53.1753°N 4.1629°W / 53.1753; -4.1629 (Rectangular Earthwork 110m NW of Coed Ty Mawr), SH555664		Caernarvonshire	4Medieval	CN156 [69]
	Castell Llanddeiniolen	Motte	Llanddeiniolen	53°10′04″N 4°08′29″W / 53.1677°N 4.1414°W / 53.1677; -4.1414 (Castell Llanddeiniolen), SH569655		Caernarvonshire	4Medieval	CN197 [70]
	Llys Dinorwig	Enclosure	Llanddeiniolen	53°08′47″N 4°09′03″W / 53.1463°N 4.1508°W / 53.1463; -4.1508 (Llys Dinorwig), SH562631		Caernarvonshire	4Medieval	CN223 [71]
	Pen-Ucha'r-Llan Ringwork	Ringwork	Llandderfel	52°55′07″N 3°34′50″W / 52.9186°N 3.5805°W / 52.9186; -3.5805 (Pen-Ucha'r-Llan Ringwork), SH938368		Merionethshire	4Medieval	ME042 [72]
	Domen Ddreiniog	Motte	Llanegryn	52°36′44″N 4°04′25″W / 52.6121°N 4.0737°W / 52.6121; -4.0737 (Domen Ddreiniog), SH596036		Merionethshire	4Medieval	ME054 [73]
	Cymer Abbey	Abbey	Llanelltyd	52°45′29″N 3°53′46″W / 52.7581°N 3.8962°W / 52.7581; -3.8962 (Cymer Abbey), SH721195		Merionethshire	4Medieval	ME001 [74]
	Cymmer Castle	Motte	Llanelltyd	52°45′31″N 3°52′51″W / 52.7585°N 3.8808°W / 52.7585; -3.8808 (Cymmer Castle), SH731195		Merionethshire	4Medieval	ME150 [75]
	Castell y Bere	Castle	Llanfihangel-y-Pennant	52°39′30″N 3°58′16″W / 52.6583°N 3.9711°W / 52.6583; -3.9711 (Castell y Bere), SH667085		Merionethshire	4Medieval	ME023 [76]
	Pont Maesgwm Deserted Rural Settlement	Deserted Rural Settlement	Llanfrothen	52°58′34″N 4°01′57″W / 52.976°N 4.0324°W / 52.976; -4.0324 (Pont Maesgwm Deserted Rural Settlement), SH635440		Merionethshire	4Medieval	ME193 [77]
	Castell Gronw Castle Mound	Motte	Llangywer	52°54′07″N 3°35′32″W / 52.902°N 3.5921°W / 52.902; -3.5921 (Castell Gronw Castle Mound), SH930350		Merionethshire	4Medieval	ME067 [78]
	Huts 90m N of Cil Twllan	Platform house	Llanllechid	53°10′40″N 4°02′25″W / 53.1779°N 4.0403°W / 53.1779; -4.0403 (Huts 90m N of Cil Twllan), SH637664		Caernarvonshire	4Medieval	CN144 [79]
	Cwm Caseg Deserted Rural Settlement	Deserted Rural Settlement	Llanllechid	53°10′39″N 4°01′31″W / 53.1774°N 4.0254°W / 53.1774; -4.0254 (Cwm Caseg Deserted Rural Settlement), SH647664		Caernarvonshire	4Medieval	CN314 [80]
	Ty-Newydd Mound & Bailey Castle	Motte & Bailey	Llannor	52°55′00″N 4°27′37″W / 52.9166°N 4.4604°W / 52.9166; -4.4604 (Ty-Newydd Mound & Bailey Castle), SH346383		Caernarvonshire	4Medieval	CN096 [81]
	Castell Carn Dochan	Castle	Llanuwchllyn	52°51′40″N 3°42′50″W / 52.861°N 3.7139°W / 52.861; -3.7139 (Castell Carn Dochan), SH847306		Merionethshire	4Medieval	ME049 [82]
	Tomen Fawr	Ringwork	Llanystumdwy	52°54′50″N 4°18′01″W / 52.9139°N 4.3002°W / 52.9139; -4.3002 (Tomen Fawr), SH454376		Caernarvonshire	4Medieval	CN031 [83]
	Ffynnon Gybi	Holy Well	Llanystumdwy	52°56′44″N 4°20′32″W / 52.9456°N 4.3421°W / 52.9456; -4.3421 (Ffynnon Gybi), SH427412		Caernarvonshire	4Medieval	CN037 [84]
	Penarth Fawr Medieval House	House (domestic)	Llanystumdwy	52°54′48″N 4°21′09″W / 52.9132°N 4.3524°W / 52.9132; -4.3524 (Penarth Fawr Medieval Hall), SH419376		Caernarvonshire	4Medieval	CN086 [85]
	Tomen Las Castle Mound	Motte	Pennal	52°35′04″N 3°55′28″W / 52.5845°N 3.9245°W / 52.5845; -3.9245 (Tomen Las Castle Mound), SH697002		Merionethshire	4Medieval	ME043 [86]
	Inscribed Stone in Llanfihangel Traethau Churchyard	Inscribed stone	Talsarnau	52°53′51″N 4°05′25″W / 52.8975°N 4.0902°W / 52.8975; -4.0902 (Inscribed Stone in Llanfihangel Traethau Churchyard), SH595353		Merionethshire	4Medieval	ME050 [87]
	Llidiart-Garw Platform House and Paddock	Platform house	Talsarnau	52°52′42″N 4°03′51″W / 52.8784°N 4.0641°W / 52.8784; -4.0641 (Llidiart-Garw Platform House and Paddock), SH611332		Merionethshire	4Medieval	ME112 [88]
	Castell Prysor	Motte & Bailey	Trawsfynydd	52°54′53″N 3°50′55″W / 52.9148°N 3.8487°W / 52.9148; -3.8487 (Castell Prysor), SH757368		Merionethshire	4Medieval	ME045 [89]
	Bont-Newydd	Bridge	Aber	53°13′42″N 4°00′18″W / 53.2282°N 4.0049°W / 53.2282; -4.0049 (Bont-Newydd), SH662720		Caernarvonshire	5Post-Medieval/Modern	CN061 [90]
	Cwm Erch Copper Mine	Copper mine	Beddgelert	53°03′25″N 4°02′24″W / 53.057°N 4.04°W / 53.057; -4.04 (Cwm Erch Copper Mine), SH633530		Caernarvonshire	5Post-Medieval/Modern	CN193 [91]
	Glasdir Copper and Gold Mine Mill	Mill	Brithdir and Llanfachreth	52°47′09″N 3°52′17″W / 52.7857°N 3.8715°W / 52.7857; -3.8715 (Glasdir Copper and Gold Mine Mill), SH738225		Merionethshire	5Post-Medieval/Modern	ME206 [92]
	Pont y Cim	Bridge	Clynnog	53°02′43″N 4°19′35″W / 53.0452°N 4.3263°W / 53.0452; -4.3263 (Pont y Cim), SH441523		Caernarvonshire	5Post-Medieval/Modern	CN053 [93]
	Water Balance Incline at Aberllefenni Slate Quarry	Incline	Corris	52°40′29″N 3°49′26″W / 52.6746°N 3.824°W / 52.6746; -3.824 (Water Balance Incline at Aberllefenni Slate Quarry), SH767101		Merionethshire	5Post-Medieval/Modern	ME185 [94]
	Gorseddau or Ynysypandy Slate Factory	Slate mill	Dolbenmaen	52°58′05″N 4°09′35″W / 52.9681°N 4.1598°W / 52.9681; -4.1598 (Gorseddau or Ynysypandy Slate Factory), SH550433		Caernarvonshire	5Post-Medieval/Modern	CN160 [95]
	Gilfach Copper Mine	Copper mine	Dolbenmaen	53°00′25″N 4°11′54″W / 53.0069°N 4.1984°W / 53.0069; -4.1984 (Gilfach Copper Mine), SH526477		Caernarvonshire	5Post-Medieval/Modern	CN170 [96]
	Gorseddau Slate Quarry	Railway	Dolbenmaen	52°59′09″N 4°07′40″W / 52.9858°N 4.1279°W / 52.9858; -4.1279 (Gorseddau Slate Quarry), SH572452		Caernarvonshire	5Post-Medieval/Modern	CN303 [97]
	Treforys Deserted Quarry Settlement	Settlement	Dolbenmaen	52°59′11″N 4°08′42″W / 52.9865°N 4.1451°W / 52.9865; -4.1451 (Treforys Deserted Quarry Settlement), SH560453		Caernarvonshire	5Post-Medieval/Modern	CN321 [98]
	Pont Scethin	Bridge	Dyffryn Ardudwy	52°47′32″N 4°01′35″W / 52.7922°N 4.0265°W / 52.7922; -4.0265 (Pont Scethin), SH634235		Merionethshire	5Post-Medieval/Modern	ME126 [99]
	Pont Dol-y-Moch	Bridge	Ffestiniog	52°57′22″N 3°57′33″W / 52.9561°N 3.9592°W / 52.9561; -3.9592 (Pont Dol-y-Moch), SH685416		Merionethshire	5Post-Medieval/Modern	ME039 [100]
	Berth-Llwyd & Cefn Coch Gold Mining Complex	Mill	Ganllwyd	52°47′36″N 3°54′13″W / 52.7932°N 3.9035°W / 52.7932; -3.9035 (Berth-Llwyd & Cefn Coch Gold Mining Complex), SH717233		Merionethshire	5Post-Medieval/Modern	ME119 [101]
	Hermon or Dolfwynog Copper/Gold Bog Kiln	Kiln	Ganllwyd	52°48′43″N 3°52′18″W / 52.812°N 3.8716°W / 52.812; -3.8716 (Hermon or Dolfwynog Copper/Gold Bog Kiln), SH739254		Merionethshire	5Post-Medieval/Modern	ME198 [102]
	Cwm Heisian West Lead and Gold Mine	Mill	Ganllwyd	52°50′03″N 3°52′34″W / 52.8343°N 3.876°W / 52.8343; -3.876 (Cwm Heisian West Lead and Gold Mine), SH737279		Merionethshire	5Post-Medieval/Modern	ME204 [103]
	Pont Llanbedr	Bridge	Llanbedr	52°49′13″N 4°06′02″W / 52.8203°N 4.1006°W / 52.8203; -4.1006 (Pont Llanbedr), SH585268		Merionethshire	5Post-Medieval/Modern	ME026 [104]
	Dinorwic Quarry: Hafod Owen Winding Engine, Locomotive Shed, Main Waterwheel and Housing	Wheelhouse	Llanddeiniolen	53°07′13″N 4°06′55″W / 53.1203°N 4.1154°W / 53.1203; -4.1154 (Dinorwic Quarry: Hafod Owen Winding Engine, Locomotive Shed, Main Waterwheel and Housing), SH585602		Caernarvonshire	5Post-Medieval/Modern	CN163 [105]
	Dinorwic Quarry Barracks 'A' Incline	Barracks	Llanddeiniolen	53°07′12″N 4°06′39″W / 53.12°N 4.1108°W / 53.12; -4.1108 (Dinorwic Quarry Barracks 'A' Incline), SH586601		Caernarvonshire	5Post-Medieval/Modern	CN177 [106]
	Vivian Slate Quarry, Inclines, Walia & associated structures	Incline	Llanddeiniolen	53°07′28″N 4°06′51″W / 53.1244°N 4.1141°W / 53.1244; -4.1141 (Vivian Slate Quarry, Inclines, Walia & associated structures), SH586606		Caernarvonshire	5Post-Medieval/Modern	CN198 [107]
	Dinorwic Quarry	Slate mill	Llanddeiniolen	53°07′25″N 4°05′48″W / 53.1236°N 4.0966°W / 53.1236; -4.0966 (Dinorwic Quarry), SH597605		Caernarvonshire	5Post-Medieval/Modern	CN337 [108]
	Pont Fawr	Bridge	Llandderfel	52°55′02″N 3°30′56″W / 52.9171°N 3.5155°W / 52.9171; -3.5155 (Pont Fawr), SH982366		Merionethshire	5Post-Medieval/Modern	ME027 [109]
	Dinas Dinlle Seagull Trench	Seagull Trench	Llandwrog	53°04′59″N 4°20′07″W / 53.0831°N 4.3354°W / 53.0831; -4.3354 (Dinas Dinlle Seagull Trench), SH436565		Caernarvonshire	5Post-Medieval/Modern	CN396 [110]
	Slate Gwaliau at Felin Fawr, Penrhyn	Wall	Llandygai	53°10′37″N 4°04′26″W / 53.1769°N 4.074°W / 53.1769; -4.074 (Slate Gwaliau at Felin Fawr, Penrhyn), SH614664		Caernarvonshire	5Post-Medieval/Modern	CN297 [111]
	Ogwen Fish Weir	Fish weir	Llandygai	53°14′25″N 4°05′39″W / 53.2404°N 4.0943°W / 53.2404; -4.0943 (Ogwen Fish Weir), SH600730		Caernarvonshire	5Post-Medieval/Modern	CN335 [112]
	Cegin Viaduct (Penrhyn Railroad)	Viaduct	Llandygai	53°13′48″N 4°06′35″W / 53.2299°N 4.1098°W / 53.2299; -4.1098 (Cegin Viaduct (Penrhyn Railroad)), SH592723		Caernarvonshire	5Post-Medieval/Modern	CN380 [113]
	Llanelltyd Bridge	Bridge	Llanelltyd	52°45′22″N 3°54′04″W / 52.7562°N 3.901°W / 52.7562; -3.901 (Llanelltyd Bridge), SH718193		Merionethshire	5Post-Medieval/Modern	ME006 [114]
	Water Powered Chain Incline at Bryneglwys Slate Quarry	Water Power System	Llanfihangel-y-Pennant	52°37′44″N 3°55′55″W / 52.6289°N 3.9319°W / 52.6289; -3.9319 (Water Powered Chain Incline at Bryneglwys Slate Quarry), SH693052		Merionethshire	5Post-Medieval/Modern	ME186 [115]
	Alltwyllt Slate Quarry Incline	Incline	Llanfihangel-y-Pennant	52°38′27″N 3°57′01″W / 52.6407°N 3.9503°W / 52.6407; -3.9503 (Alltwyllt Slate Quarry Incline), SH681065		Merionethshire	5Post-Medieval/Modern	ME205 [116]
	Rhosydd Incline, Drumhouse & Tramway	Industrial monument	Llanfrothen	52°59′52″N 4°00′05″W / 52.9977°N 4.0013°W / 52.9977; -4.0013 (Rhosydd Incline, Drumhouse & Tramway), SH657463		Merionethshire	5Post-Medieval/Modern	ME142 [117]
	Corn Drying Kiln Near Carn-Gadell Uchaf	Kiln	Llangelynnin	52°39′18″N 4°05′14″W / 52.655°N 4.0871°W / 52.655; -4.0871 (Corn Drying Kiln Near Carn-Gadell Uchaf), SH589084		Merionethshire	5Post-Medieval/Modern	ME116 [118]
	The Holyhead Road: the Ogwen Pass	Road	Llanllechid	53°07′39″N 4°01′21″W / 53.1276°N 4.0226°W / 53.1276; -4.0226 (The Holyhead Road: the Ogwen Pass), SH647608		Caernarvonshire	5Post-Medieval/Modern	CN338 [119]
	Drws y Coed Copper Mine	Copper mine	Llanllyfni	53°03′29″N 4°10′15″W / 53.0581°N 4.1707°W / 53.0581; -4.1707 (Drws y Coed Copper Mine), SH546534		Caernarvonshire	5Post-Medieval/Modern	CN162 [120]
	Dorothea Quarry Beam Engine	Engine house	Llanllyfni	53°03′15″N 4°14′37″W / 53.0542°N 4.2435°W / 53.0542; -4.2435 (Dorothea Quarry Beam Engine), SH497531		Caernarvonshire	5Post-Medieval/Modern	CN165 [121]
	Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc.	Engine house	Llanllyfni	53°03′13″N 4°14′21″W / 53.0537°N 4.2393°W / 53.0537; -4.2393 (Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc), SH500530		Caernarvonshire	5Post-Medieval/Modern	CN199 [122]
	Pen-yr-Orsedd Quarry, Blondins and Associated Structures	Engine house	Llanllyfni	53°03′49″N 4°13′35″W / 53.0635°N 4.2265°W / 53.0635; -4.2265 (Pen-yr-Orsedd Quarry, Blondins and Associated Structures), SH509541		Caernarvonshire	5Post-Medieval/Modern	CN208 [123]
	Ty Mawr East Slate Quarry Winding Engine House	Engine house	Llanllyfni	53°02′57″N 4°14′27″W / 53.0492°N 4.2407°W / 53.0492; -4.2407 (Ty Mawr East Slate Quarry Winding Engine House), SH499525		Caernarvonshire	5Post-Medieval/Modern	CN300 [124]
	Blaen y Cae Slate Quarry	Unclassified site	Llanllyfni	53°03′33″N 4°14′35″W / 53.0591°N 4.243°W / 53.0591; -4.243 (Blaen y Cae Slate Quarry), SH497536		Caernarvonshire	5Post-Medieval/Modern	CN301 [125]
	Cloddfa'r Lon Slate Quarry	Slate mill	Llanllyfni	53°03′23″N 4°14′08″W / 53.0564°N 4.2356°W / 53.0564; -4.2356 (Cloddfa'r Lon Slate Quarry), SH503534		Caernarvonshire	5Post-Medieval/Modern	CN302 [126]
	Pont Tai-Hirion Old Bridge	Bridge	Llanycil	52°56′33″N 3°46′56″W / 52.9424°N 3.7821°W / 52.9424; -3.7821 (Pont Tai-Hirion Old Bridge), SH803398		Merionethshire	5Post-Medieval/Modern	ME028 [127]
	Capel Gallt-Coed	Chapel	Llanystumdwy	52°56′18″N 4°16′37″W / 52.9382°N 4.277°W / 52.9382; -4.277 (Capel Gallt-Coed), SH470402		Caernarvonshire	5Post-Medieval/Modern	CN117 [128]
	Afon Cynfal Deserted Rural Settlement	Rectangular hut settlement	Maentwrog	52°57′17″N 3°51′35″W / 52.9547°N 3.8597°W / 52.9547; -3.8597 (Afon Cynfal Deserted Rural Settlement), SH751413		Merionethshire	5Post-Medieval/Modern	ME190 [129]
	Afon Goch Deserted Rural Settlement	Longhouse	Maentwrog	52°57′00″N 3°51′30″W / 52.9501°N 3.8582°W / 52.9501; -3.8582 (Afon Goch Deserted Rural Settlement), SH753407		Merionethshire	5Post-Medieval/Modern	ME191 [130]
	Pont Minllyn	Bridge	Mawddwy	52°42′38″N 3°41′21″W / 52.7106°N 3.6891°W / 52.7106; -3.6891 (Pont Minllyn), SH859138		Merionethshire	5Post-Medieval/Modern	ME094 [131]
	Machynlleth Bridge	Bridge	Pennal, (also Machynlleth), (see also Powys)	52°36′02″N 3°51′21″W / 52.6005°N 3.8557°W / 52.6005; -3.8557 (Machynlleth Bridge), SH744019	Also known as Pont ar Dyfi	Merionethshire	5Post-Medieval/Modern	MG002 [132]
	Cei Tyddyn Isa	Quarry	Penrhyndeudraeth	52°56′05″N 4°02′28″W / 52.9348°N 4.0412°W / 52.9348; -4.0412 (Cei Tyddyn Isa), SH629395		Merionethshire	5Post-Medieval/Modern	ME108 [133]
	Pen-y-Gwryd Pillboxes	Pillbox	Beddgelert	53°04′48″N 4°00′13″W / 53.0799°N 4.0036°W / 53.0799; -4.0036 (Pen-y-Gwryd Pillboxes), SH659555		Caernarvonshire	5.9Post-Medieval/Modern	CN397 [134]
	Fairbourne Anti-invasion Defences	Anti-invasion defence site	Arthog	52°41′54″N 4°03′26″W / 52.6983°N 4.0571°W / 52.6983; -4.0571 (Fairbourne Anti-invasion Defences), SH610131	The tank traps stretch for some 3 kilometres (1.9 mi) along the beach	Merionethshire	5.9Post Medieval/Modern	ME252 [135]
	Anti-invasion Defences 630m E of Cae'r-tyddyn	Anti-tank Obstacle	Brithdir and Llanfachreth	52°44′23″N 3°47′07″W / 52.7396°N 3.7854°W / 52.7396; -3.7854 (Anti-invasion Defences 630m E of Cae'r-tyddyn), SH795172		Merionethshire	5.9Post-Medieval/Modern	ME250 [136]
	Nant Ffrancon Anti-invasion Defences	Anti-invasion defence site	Llandygai, (also Capel Curig), (see also Conwy)	53°07′31″N 4°01′20″W / 53.1252°N 4.0222°W / 53.1252; -4.0222 (Nant Ffrancon Anti-invasion Defences), SH647605		Caernarvonshire	5.9Post-Medieval/Modern	CN399 [137]
	Anti-invasion Defences 2000m NE of Cwmrhwyddfor Farm	Anti-tank Obstacle	Llanfihangel-y-Pennant	52°42′13″N 3°50′57″W / 52.7036°N 3.8492°W / 52.7036; -3.8492 (Anti-invasion Defences 2000m NE of Cwmrhwyddfor Farm), SH751133		Merionethshire	5.9Post-Medieval/Modern	ME251 [138]

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Scheduled monuments in Gwynedd, Wales.
=Roman =Early Medieval
=Medieval =Post-Medieval/Modern

• List of Cadw properties
• List of castles in Wales
• List of hill forts in Wales
• Historic houses in Wales
• List of monastic houses in Wales
• List of museums in Wales
• List of Roman villas in Wales

• Coflein is the online database of RCAHMW: Royal Commission on the Ancient and Historical Monuments of Wales, GAT is the Gwynedd Archaeological Trust, Cadw is the Welsh Historic Monuments Agency