Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Visible below the waves are memorials to the city's Gold Rush dead.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

The intriguing personal collection of a professional demon-chaser.

The angel of death appears to weep black tears at this grave marker.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Quite simply the largest tree in the world (by volume).

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Oregon's unexpected high desert, displaying layers of time in a colorful show.

An acoustic anomaly with a mysterious cause.

The world's longest known cave system.

The largest earthwork effigy in the world.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.