One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

The largest self-built castle in the U.S., six decades in the making.

3,000 market stands in five former Zeppelin hangars.

Frequent fliers welcome in this airplane hotel.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

The deepest metro station in the world.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

An Art Nouveau building covered in animal gargoyles and grotesques.

Commonly acknowledged as the only public monument to the Devil himself.

Berlin's old airport.

Vibrant street art created with mixed media.

An industrial relic is now one of Europe's most staggering art spaces.

Visitors to this library are in for a real-world education in modernist architecture.

The ancient latrines of the Greeks, in all their public glory.

Roman ruins top white travertine terraces formed by ancient hot springs.

When flour explodes, it's not a pretty sight.

Statue dedicated to the star of an old television show.

Largest illuminated advertisement sign in the world.

Twisted buildings adorn the banks of the Rhine river.

The footprint of a frustrated devil in Munich's Cathedral.

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

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

These medieval skyscrapers dominate the skyline of this small Tuscan town.