This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

An ancient knight and a symbol of the city's freedom.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

An abandoned masterpiece of Soviet Brutalist architecture.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

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

Padlocks cover this rickety footbridge with love.

This unique Lady Liberty is one of the only examples of the figure sitting down.

This oddly shaped building is a surprising Soviet-era crematorium.

This Ukranian fortress is one of the best-preserved medieval castles in Europe.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

The last planned Soviet city was built for the former residents of Prypiat after the Chornobyl disaster.

The spectacular Roshen Fountain show lights up the night sky all summer long, until it "hibernates" under the ice waiting for spring to come.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

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

World's largest crossword puzzle spans the side of a towerblock, its clues scattered throughout the city.

An Art Nouveau building covered in animal gargoyles and grotesques.