Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

Gigantic water vessel, permanently grounded in Southern Albania.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

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

A naturally beautiful, seemingly bottomless deep blue spring.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

It's the only museum of its kind in Ukraine.

The eerie burnt-out remains of a prominent building where 30 protestors lost their lives.

Sculpture that doubles as a time capsule so that life can survive radiation outside Chernobyl.

This Ukraine alleyway has become its own little island of forgotten things.

An Art Nouveau building covered in animal gargoyles and grotesques.

The deepest metro station in the world.

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

When you've got to go, you've got to go.

In the land of the Light Brigade stands a testament to the Cold War.

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

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

The largest catacomb system in the world.

This attraction was abandoned after the Chernobyl disaster.

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

Romania's triumphal arch looks out over Bucharest.

A collection of items from a way of life that no longer exists.

Romania's only crater lake with water as pure as if distilled.