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

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

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

This abandoned airplane hanger is said to have once been a top secret launch facility.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

This abandoned Belgian fortress is purposefully being left to nature.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

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

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Monasteries on rock pillars, once accessible only by frayed ropes.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

Once the largest rope factory in Greece, this abandoned plant now stands like a ghost of industry past.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.