Huge stone depressions which may have acted as an Incan agricultural experiment.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

An unexpected desert oasis in South America.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A remarkable geological formation resembling a forest made of stone.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A varied collection of brains in alcohol.

A museum honoring Germany’s cucumber mecca offers a great dill of gherkin history.

There are two dozen tanks just sitting in an open field in Lower Saxony.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Blitzkrieg bop your way through Berlin's Ramones Museum.

The prototype for all Nazi concentration camps.

This historic stone bridge has an entire neighborhood clinging to its sides.

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