menhir d'Er Grah (monument) built
5000 BCE.
Shown on the map at 47.571°, -2.950°.
The Locmariaquer megaliths are a complex of Neolithic constructions in Locmariaquer, Brittany. They comprise the elaborate Er-Grah tumulus passage grave, a dolmen known as the Table des Marchands and "The Broken Menhir of Er Grah", the largest known single block of stone to have been transported and erected by Neolithic people.
Text from the Wikipedia article Locmariaquer megaliths, licensed CC BY-SA 4.0.