From far, it looks like an abandoned flying saucer sitting on top of the hill but the Buzludzha monument is an enormous construction built on Bulgaria's Balkan mountains to mark the site where the Bulgarian Communist party was founded in 1891.
Buzludzha opened in 1981 but after the fall of communism it was left abandoned by the Bulgarian government. Since then it has been heavily vandalised and is now a destination for urban explorers and tourists.
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