The hallucinogenic center of the ancient world.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

A lovely biographical museum in the artist's home of 24 years.

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

The world's tallest boat lift stands as a massive piece of industrial tourism.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

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

The highest point in Belgium is a staircase to nowhere.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A Museum of Psychiatry in a still-operating mental institution.

Hiding the longest subterranean river known in the world.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

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

Oriental bazaar in the heart of Sarajevo.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

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

A museum dedicated to a Cold War era sausage.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.