Tombeau de Merlin

The Tombeau de Merlin is a megalithic monument dating from the Neolithic period located in the Forest of Paimpont, at a place called La Marette near the hamlet of Landelles in Paimpont.

A tradition dating from the 12th century has it that Merlin had a tomb in the legendary forest of Brocéliande, Félix Bellamy defining its location in the forest in 1889. Shortly afterwards the Tombeau de Merlin was largely destroyed by grave robbers, but it has nevertheless become an important tourist site.

In Britain, Bardsey Island, Drumelzier and Marlborough also claim to have Merlin's grave.

Source: Wikipedia