The Buzludzha Monument was the headquarters of the Communist Party in Buglaria in the 1980s. After the fall of the regime, the building was abandoned, destroyed and left to decay.
Its impressive size and architecture attract visitors from all over the world, and its UFO shape is quite iconic.
Some people had the opportunity to see the building inside entering through illegal entrances until a few years ago when a project for restoration of the mozaics inside was started. Now, the monument is guarded 24/7 and you must book a tour with registered tour company to visit.