Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Legends surround this jagged rock formation in the New Mexico desert.

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

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

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

This is one really big nut.

More than 21,000 images fill this overlooked gem of a prehistoric site.

Home of the International Space Hall of Fame.

Apparently, the whole cosmos emanates from this plain concrete tower.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The world's longest known cave system.

An experimental, automotive replica of Stonehenge.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A museum dedicated to the alleged Roswell Incident.

A former zoo turned public park, where visitors can hang out in the old animal cages.

Enormous lake at the bottom of a unique cave system.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

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

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.