This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

Bad farming practices caused this unnatural natural wonder.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This scented city oasis was a labor of love.

A natural formation that resembles a camel resting in the New Mexico desert.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

A clear blue swimming hole with hidden caves, still unexplored.

These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

This small Arkansas town once had a close encounter with the Beatles, and are determined never to let anyone forget that. Ever.

An extravagant western hotel where every floor is the "ground floor."

The Ozarks' strangest dwelling.

The only diamond mine in the world where you can keep what you find.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This tiny 19th-century tunnel was built so a man could move his cows from one field to another.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.