A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Apartment complexes built into huge repurposed natural gas tanks.

This museum promotes informed contraception by documenting its often secret past.

Where beer lovers can literally immerse themselves in beer.

This cubist Vienna church building looks like some sort of alien stonehenge.

A spherical "micro-nation" in the heart of Vienna.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

One of the world's southernmost bars.

The sophisticated hydraulic system of the Nazca civilization.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

After an epic flood washed away its enslavers, this city has been part ghost town, part cultural wildcard for the past three centuries.

Art school in the Amazon: Drugs, nature and sustainable agriculture.

Ain't no party like a ghost town party.

A colorful Peruvian city of the dead.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

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

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

Sleep in a glass pod dangling off a cliff.

A remarkable geological formation resembling a forest made of stone.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

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

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