🇬🇧 United Kingdom · Earthwork
Fiskerton Causeway
Iron Age, Early to Middle La Tene 456-395 BCE · Iron Age La Tene Lincolnshire
456/395 BCE Iron Age timber causeway (175 m) at Fiskerton, Witham Valley with 11 votive swords and logboats.
🇮🇪 Ireland · Earthwork
Corlea Trackway
Iron Age, Late La Tene 148 BCE · Late Iron Age La Tene Ireland
147 BCE Iron Age oak plank highway (3.2 m wide, 1.6 km) across Corlea Bog, largest European timber road built in one year.
🇬🇧 United Kingdom · Earthwork
Carn Ingli Hillfort
Iron Age (c.500 BCE–100 CE) with Bronze Age cairn · Iron Age Welsh (Demetae) / Early Medieval
Rocky tor-top hillfort (343 m) above Newport — stone-rampart contour fort with hut circles on Mynydd Carningli.
🇮🇪 Ireland · Ancient village
Keenagh (Corlea 2) Bog Trackway (County Roscommon–Longford border)
Iron Age (Late Iron Age, La Tène D, 148 BCE) · Irish Iron Age (La Tène, Uisnech kingship)
Iron Age 1-km oak causeway (148 BCE) — Keenagh's in situ twin to Corlea 1, part of 5-trackway Shannon bog field.
🇵🇱 Poland · Ancient village
Biskupin Iron Age Lake Fort
Early Iron Age, Lusatian culture Hallstatt C · Lusatian (Lausitz) culture Hallstatt-period farmers
740 BCE Lusatian lake-fort—106 identical street-grid houses on Lake Biskupin islet.
🇬🇧 United Kingdom · Ancient village
Goldcliff Severn Estuary Iron Age Trackways – Magor Pill
Neolithic to Iron Age (peak Iron Age) · Bronze Age to Iron Age Severn communities
Iron Age corduroy trackways (1000–100 BCE) on Goldcliff intertidal peat shelf — 30-m brushwood causeways.
🇮🇪 Ireland · Ancient village
Clonbrin Causey (Edercloon) – Longford/Offaly Bog Road
Late Iron Age (La Tène) · Irish Iron Age (Ulster–Connacht)
1.5-km Iron Age oak plank causeway (120 BCE) — Edercloon's wheeled transport togher.
🇮🇪 Ireland · Earthwork
Hill of Tara
Neolithic to Early Medieval (c.3400 BCE–1200 CE) · Neolithic → Iron Age La Tène → Early Medieval Gaelic
Ireland's paramount ceremonial landscape (142 ha) — Neolithic tomb, Lia Fáil kingship stone and Iron Age royal enclosure complex.
🇮🇪 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.
🇩🇪 Germany · Ancient village
Campen Plank Road – Emsland Bog Trackway (Landegge)
Early Iron Age (Hallstatt C) · Ems-Hunte Iron Age (Pre-Roman)
1.2-km split-oak corduroy (668 BCE) across Campen Moor — earliest Emsland Bohlenweg.
🇮🇪 Ireland · Earthwork
Dún Aonghasa
Late Bronze Age to Early Medieval (c.1100 BCE–800 CE) · Atlantic Iron Age / Early Medieval Gaelic
Cliff-edge triple stone fort on Inishmore (6 ha) with massive chevaux-de-frise of jagged limestone — Ireland's most dramatic hillfort.
🇸🇪 Sweden · Earthwork
Eketorp Ringfort — Öland
Iron Age to Medieval (c.400–1300 CE) · Scandinavian Migration/Vendel and Medieval Gotlandic–Swedish
Eketorp, on southeastern Öland's Stora Alvaret limestone plain, is the only fully excavated of Öland's 19 Iron Age ringforts, a concentric limestone-walled fortress 70 m diameter with 53…
🇸🇪 Sweden · Earthwork
Stavgard Ringfort (Gotland)
Migration Period to Vendel Period (c.400–800 CE) · Gotlandic Iron Age
Pre-Viking ringfort (fornborg) on Gotland's southeast, circular limestone wall 80–100 m diameter enclosing 0.5 ha, with inner house terraces and Iron Age ceramics.
🇱🇦 Laos · Megalith
Plain of Jars
Iron Age 500 BCE – 500 CE (some lids to 800 CE) · Unknown Austroasiatic? Ancestors of Lao-Tai
Megalithic landscape of >90 sites with >2,100 large carved sandstone jars (1–3 m tall, up to 14 t) scattered across Xiangkhouang plateau, carved 500 BCE–500 CE, associated with mortuary rites and…