I’m not a communist, but I have to say that they built some fascinating buildings.  In fact, the Storefront for Art & Architecture in Manhattan currently has an exhibit devoted to some of there most incredible buildings in CCCP: Cosmic Communist Constructions Photographed.  It features a series of building across the former USSR photographed by Frederic Chaubin (for an interview with Frederic, click here).  All were built during the last two decades of the Soviet Union, when a bureaucracy focused on gracefully losing the Cold War had no time to censor its architecture.

Check out this sanatorium in Yalta, which during construction was mistaken as a missile silo (you can see why):

Another building featured is the “Building of the Ministry of Highways of the Georgian Soviet Socialist Republic”:

Another Tbilisi building included was the “Ceremonial Palace” - where couples were married.  Despite looking rather church-like, it was officially non-denominational in the strictly Soviet state.  Apparently it has recently been bought by a local oligarch:

Possibly the most amazing building was the retreat for the Armenian President - but I can’t find a photo of it anywhere!