A quirky collection of old chairs fills a random vacant lot in suburban Texas.

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

See massive fossils that are over 200 million years old in northeastern Arizona.

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

This naturally-sourced hot spring is now home to a clothing-optional resort.

One part antique store, one part curiosities hodge-podge.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A museum dedicated to the alleged Roswell Incident.

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

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A self-built castle made by a mysterious man.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A heavenly experience, right here on Terra Firma.

This abandoned amusement park was built on a site with a dark history.

Odd outsider art installations surround a Gold Rush-era ghost town.

The first declared National Monument in the United States.

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

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Stroll through a wonderland of stupendous moss-covered trees.