Locmariaquer is a Neolithic archaeological site comprised of two large stone tombs and a menhir (standing stone). All of the structures were built sometime in the 5th millennium BCE, with the Grand-Menhir being built first. Before collapsing sometime around 4000 BCE, the Grand-Menhir was a single piece of granite that stood over 20 meters (65.6168 feet) tall and weighed about 280 metric tons (617,294 lbs).
The Er-Grah tumulus is located a few feet away from the Grand-Menhir and dates back to around 4200 BCE. The second tomb, the Table-des-Marchand, was constructed around 4000 BCE and gets its name (“Table of Merchants”) from the massive stone slab over the roof of the interior chamber.
