An Area 51 in Russia? Some people think so. Starting in the Brezhnev period, Russia has been pursuing construction of a massive underground facility at Yamantau Mountain and the city of Mezhgorye in the southern Urals. Hidden inside Yamantau mountain , the project involved the creation of a huge complex - it covers an area the size of the Washington area inside the Beltway - served by a railroad, a highway, and thousands of workers." FInd out more.