Bryn Celli Ddu

This is a religious site (circa 2000BC) from the latter Neolithic era, which was built during two different periods. To begin with, a "henge" was built, with a ditch and a circle of standing stones (still visible from behind the mound). After that, a chamber made of stones was added where the remains of the dead were buried. This chamber was accessible by a path beneath the mound.