This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

This historic cemetery was inaccessible for several years due to dozens of land mines.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This historic black and white monastery is one of Bulgaria's architectural jewels.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A war-torn Olympic relic is being overtaken by graffiti and nature.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

These warring psychedelic crags commemorate an unsuccessful military operation.

Bridge that died in war and was resurected.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

Museum covers every step of the chocolate-making process, from cultivation to the finished product.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

A garden of flying flowers.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This museum is housed in an unassuming building that witnessed one of the most daring feats of satire in modern history.

This interactive sculpture allows visitors to leave a message in case a friend passes by.