Interior of The Special Astrophysical Observatory (SAO RAS) built in 1966. "Based in the Bolshoi Zelenchuk Valley of the Greater Caucasus near the village of Nizhny Arkhyz, the observatory houses the large BTA-6 optical telescope and RATAN-600 radio telescope".
https://www.darkroastedblend.com/2012/09/flying-saucer-soviet-architecture-in.html