Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Southern Italy's spinning top village.

The sunlight passing through the opening of this huge cave system creates a magical effect.

This modern monument to pagan belief looks like it was transported straight from ancient times.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

An Art Nouveau building covered in animal gargoyles and grotesques.

340-foot statue built to honour the Heroes of the Soviet Union.

A huge Soviet-era robotics factory in the outskirts of Prypiat, now long-abandoned.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

This derelict superstructure was a very important warning system for the Soviet military.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chornobyl disaster.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

The dining hall that nourishes workers in Chornobyl's Exclusion Zone is also open to visitors.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Macabre astrological automaton clock dating to the late 1400s.

An underground city of salt.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.