Sarmizegetusa Regia contained a citadel and residential areas with dwellings and workshops as well as a sacred zone.
The sacred zone — among the most important and largest circular and rectangular Dacian sanctuaries – includes a number of rectangular temples, the bases of their supporting columns still visible in regular arrays. Perhaps the most enigmatic construction at the site is the large circular sanctuary. It consisted of a setting of timber posts in the shape of a D, surrounded by a timber circle which in turn was surrounded by a low stone kerb. The layout of the timber settings bears some resemblance to the stone monument at Stonehenge in England.