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.

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

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

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

A remarkable geological formation resembling a forest made of stone.

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.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

These disused steel furnaces are now haunting ruins that may one day be a national park.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A toxic ghost town sitting atop a massive coal fire.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Where America's first doomsday cult awaited the end of the world.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

This free, take-a-book shop seems like a trick but isn't.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

This stately 19th century library pushed architectural boundaries at a time when the public library movement was just taking off.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Hauntingly beautiful totem poles left by the Haida.