The megalithic complex at Locmariaquer, on the strait at the mouth of the Gulf of Morbihan, contains three astonishing Neolithic monuments within a few hundred metres of each other. The Grand Menhir Brisé — the "Great Broken Menhir" — was once the largest standing stone in Europe and now lies in four enormous pieces on the ground. The Table des Marchands is a covered burial chamber with elaborate carved decoration. The Er Grah tumulus is a 140-metre-long earthwork dating to around 4200 BCE.
The site is managed by the Centre des Monuments Nationaux and has a small interpretive museum. It is much less crowded than Carnac and arguably more impressive. Allow two hours.