This early-18th-century mansion became the "House of Unions" under the Soviets, who made its magnificent gold-and-white ballroom (the Columned Hall) into the elite concert space it remains today. Lenin and Stalin both lay in state here, as millions of Russians filed past to pay their respects. English author George Bernard Shaw celebrated his 75th birthday here. Now its repertoire includes visiting international symphony orchestras and choirs, children's performances, and even fashion shows.