Brutalist architecture looks exactly like it sounds- cold and stony, devoid of embellishment but made to last, with an overall look that says "you have to be tough to live here".
This austere style of architecture was popular in the USSR and eastern Europe for obvious reasons, and this circular apartment building in Moscow nicknamed "Bublik" is the pinnacle of Brutalism.
"Bublik" was built by Soviet architect Eugene Stamo and engineer Aleksandr Markelov in the Ochakovo-Matveevskoe district of Moscow in 1972, and although six "Bubliks" (Russian for bagel) were supposed to be built only two were ever made:
This massive building holds 913 apartments and as far as architects claims, five more similar buildings were supposed to be built before 1980 Summer Olympics.
Five buildings resembling the Olympic sign were intended to be constructed, but as they were too massive it would be hard to associate them with actual Olympic rings. Soviet housing was oriented strictly on practicality and affordability but it turned out these buildings were expensive to maintain so the whole project was abandoned and only two stand to this day.
-Via design you trust