🇮🇪 Ireland · Temple complex
Clonmacnoise
Early Medieval (544–1552 CE) · Early Christian Gaelic (Columban tradition)
Great early monastery at Shannon-Esker crossing (544 CE) with cathedral, two round towers, three high crosses and 3,000 graves.
🇮🇪 Ireland · Earthwork
Grianan of Aileach
Iron Age to Early Medieval (c.1000 BCE–1100 CE) · Iron Age Gaelic → Early Medieval Uí Néill
Donegal hilltop royal cashel (23.5 m diameter) on Greenan Mountain — northern Uí Néill kingship inauguration fort.
🇮🇪 Ireland · Temple complex
Glendalough Monastic City
Early Medieval (c.590–1398 CE) · Early Christian Gaelic (Anchorite tradition)
Wicklow glacial valley monastic city (6th century St Kevin) with 33 m round tower, medieval churches and double lakes.