Around 5000 BC, the Petit Mont promontory dominating as now, the ocean, "the Mor Braz" in the south.
The huge mass of dry stones arranged in successive steps which is the Cairn was not built in one time, but the result of a long architectural process that took place over two thousand years.
A tour of 45 minutes you will discover inside dolmens, inscribed in stone, typical engravings Armoricain register, ax, snake, crest rafters, and outside an exceptional view of the bay of Quiberon to the south and the Gulf of Morbihan north.
In April, May, June and September, closed on Wednesday.
In July-August, open daily.