Rising from the top of the hill, this perplexing concrete structure can be seen for kilometers, inspiring an anxious excitement in those laying eyes on it for the first time.

A red star, the symbol for communism, glares over the valley from the top of its 70-meter-high tower. The expansive, spaceship-like base is straight out of an early science fiction movie.

The UFO reference is justified.

Officially named the House-Monument of the Bulgarian Communist Party, but better known as the “Buzludzha Monument,” it’s been attracting urban explorers from around the world since the mid-1990s.

While hundreds of abandoned communist memorials are scattered all over the Balkans, few hold quite as much intrigue.

A journey to the Buzludzha Monument passes through picturesque farmlands and bucolic villages. With no public transport connecting this part of Bulgaria, a visitor’s only option is to make their own way there.