🇫🇷 France · Megalith
Menhir de Kerloas
Late Neolithic (c.5000–4000 BCE) · Armorican Neolithic (Brittany)
Europe's tallest upright menhir (9.5 m, 150 t) — Brittany granite giant with twin basal bosses, lightning-shorn.
🇱🇹 Lithuania · Fortress
Trakai Island Castle
Medieval (1377–1430) · Grand Duchy of Lithuania (Gediminid)
The only surviving water castle in Eastern Europe, built on 2 ha island in Lake Galvė by Grand Dukes Kęstutis and Vytautas the Great (c.1377–1409) as fortified residence.