A monument to communism sits in the middle of Bulgaria in Buzludzha National Park. Like many oversize Soviet-era constructions, it is falling into ruin. But what's amazing about this building is that it is only 30 years old! Kuriositas has a look inside at the once-glorious architecture with its massive propaganda artwork and the poor condition it has fallen into only ten years after its abandonment. Link
(Image credit: Wikipedia user Infobgv)
Or it reminds me of the structure in the winter level of INCEPTION.