Soviet monument looks like UFO

The Buzludzha monument near Kazanluk, Bulgaria looks like a UFO that's been decaying for centuries, but it's actually only 36 years old.

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The former House Monument of the Bulgarian Communist Party was completed in 1981 but has stood abandoned since the government's fall from power eight years later.

The centrepiece of the hall is the communist hammer and sickle encircled by a quote from the Communist Manifesto.

The building is now closed off to the public as it is considered dangerous - though some bold travellers have managed to take a peek inside.