The fifth-longest natural arch in the world, and the longest outside China.

Most-visited and most-photographed slot canyon in the American Southwest.

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

Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

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

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

A spiritual vortex among the red rocks in Sedona.

The only Florida state park with publicly accessible caves.

One man's grief over the national tragedy has manifested in a pod of homemade whales on his front lawn.

The haunting remains of a failed housing development can still be found behind the big box stores that were to anchor them.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

Though it's unclear why it's there, the lifelike sculpture of the giant lizard is oddly charming.

This state park was once an important Native American cermonial center.

This creative sculpture was a way to "recycle" an old tree.