The Volkonskoe gorge is an open air museum in one of the first national parks in Russia, Sochi National Park. In the gorge thereis the only monolithic dolmen in the Caucasus, to this day it is not known what its purpose was. The Volknoskii dolmen is a block of sandstone 7 metres high and 16 metres long with a carved out smooth platform at a height of 4 metres. Above the platform is the fa ade and a chamber with a domed ceiling. There is a round depression on the roof. Carved steps in the stone lead to the dolmen. This is an unusual historical monument and it is said that it is close in age to the Egyptian pyramids.