Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A museum devoted entirely to the rattlesnakes and snake-related art.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The birthplace of a titan of American cinema.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Wisconsin's most celebrated export gets the royal treatment on I-94.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A bizarre house filled with an astounding array of collections.

Strange physical sensations and optical contradictions keep visitors coming back for more.

This monument honors the band's impromptu performance at Cadillac highschool's homecoming decades ago.

This museum in the woods evokes the work and lives of Michigan's 19-century lumberjacks.

A series of 33 stone markers maps an ancient 55-mile transportation route.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.