One of the few surviving "Wigwam"-themed motels.

Moonbows over Kentucky.

The world's longest known cave system.

Home of mutant livestock.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A fascinating little museum all about the rich history of Peru’s famous plant.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

This stone complex marks the urban center of a lost civilization.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

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

Death rituals and sacrifice inside a Peruvian megalith.

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.

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

The Uros people live on floating reed islands in lake Titicaca.

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

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