Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

"There's nothing there," and other lies the KGB told us.

This massive subterranean fissure is known as the "underground Grand Canyon."

During World War II, this rice mill became a Nazi concentration camp.

Handsomely crafted representations of our round planet.

Museum devoted to the artificial language of Esperanto.

A slice of central Asia in the middle of Berlin.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Scotland's first free lending library, which protects literacy through inheritance.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

Tiny communists hammer away on the Olomouc Astronomical Clock.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A perfect turquoise lake colored with glacier dust.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

This surreal art house looks like a geometric version of a small chapel.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This crumbling headstone commemorates the first death by tiger in Britain's history.