A miniature train-ride through Slovenia's largest cave system.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Erotic art covers the walls of the largest ancient pleasure palace.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The oldest public library in Ireland.

A corkscrew-shaped barn in Ireland.

A floating museum that was sunk by a flood and left to rot in the tides.

A private collection of massive steel monsters guarding a Texas pipe works.

There must be a pun in this haystack somewhere...

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Breathtaking and huge 430 year old maps of Italy.