This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

A trading post in the North Pole where children send letters.

The king of U.S. high points towers over every other peak on the continent.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

This stunning mass of ice spans 121 square miles and is still growing.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

A lush desert oasis in the shape of a narrow crescent.

The ancient remains of this natural fortress can still be found along the Silk Road looking surprisingly preserved.

Sacred Buddhist home of some spiritual monkeys.

Source for a sizable portion of Egypt's freshwater supply is more than an optical illusion.

An alien landscape of chalk-rock in the Egyptian desert.

This impressive clifftop temple was once at the center of an international custody dispute.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

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

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

These Nubian pyramids are strange and unique, even by pyramid standards.