This psychedelic tourist trap is a leisurely descent into madness.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

The most famous location in China was home to whole dynasties worth of imperial rulers.

This Bangkok high-rise looks like a rudimentary LEGO elephant.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

An ancient ossuary in Rouen.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Paris' linguistic guide to the international language of, yes, love.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The prototype for all Nazi concentration camps.

A pocket of jungle amidst urban expansion in Panama.

An Austrian house of bones filled with hundreds of intricately painted skulls.

It's not quite as old as its Roman appearance suggests, but this piece of infrastructure served Guatemala City for centuries.