What do UFOs, communism and Bulgaria have in common?

Bulgaria, a country in Eastern Europe, was under socialist rule until the revolution of 1989. While the country is now a democracy, a survey shows that about a third of the population would choose to go back to socialism. That nostalgia extends to parts of Bulgarian architecture. One of the country's most prominent and probably most eye-catching relics is this UFO-shaped building called the Buzludzha Monument, located in central Bulgaria. To this day, the timeworn structure holds a special place in the hearts of many Bulgarians.