The Cairn of Barnenez (also called the Barnenez Tumulus of Barnenez Mound) is one of the oldest structures in the world and dates back to the Neolithic period. It is a stone burial chamber and is considered to be the largest megalithic mausoleum in Europe. The cairn is made out of two burial chambers – the older one dating back to between 4850 – 4500 BCE made out of dolerite and the second one made a few hundred years later built with granite from the Île de Sterec. Megalithic art, such as wavy lines, axes, and bows, are carved into the stone chambers and passages.
