Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Berlin's old airport.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The prototype for all Nazi concentration camps.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

These massive mitts are made of 30 tons of devotional bronze.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

This huge clock made of flowers and simple machinery was once used a political weapon.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

A real (but thankfully not live) missile stands tall as a monument to the United States military in the small town of Cordele.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

A bizarre roadside attraction and the first instance of miniature golf in the world.

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

Oriental bazaar in the heart of Sarajevo.

Yugoslavia's biggest underground airport lies in ruins.