Abandoned Nazi train station turned underground astroparticle laboratory.

This 13th century Gothic brick castle is the largest in the world by surface area.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Go inside to really appreciate this 500-year-old technological masterpiece.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Historic medieval fortified city in southwest France.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

An entertainment center in a huge transparent tent.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

An abandoned Soviet-era mining town in the mountains of South Kazakhstan.

Rusting ships sit in a desert where a sea used to be.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

World's only telecommunication tower with a wooden pinnacle.

Largest illuminated advertisement sign in the world.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

The jaw of one of humankind's earliest ancestors on display at an overlooked geology museum.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

A ruined castle stands atop a hill surrounded by dragon lore.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This strategic isle was once swapped between empires and almost entirely destroyed in a bomb explosion.

This 18th-century folly is one of Europe's rare "garden mosques."

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

This small condiment museum makes all manner of mustards with a 200-year-old mill.