This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This historic national park is covered in the stunning ruins of red rock pueblos.

Ancient pueblos built into the base of a natural canyon wall.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

One of the largest, oldest, darkest, quietest motel rooms in the world.

Don't blink or you'll miss it.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The most isolated mailbox in America lets desert travelers record their passing.

The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

Crumbling pink walls and murder memorials preserve the pioneer history of Joshua Tree.

A fake town founded by Western movie stars is now becoming a hip desert community.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A self-built castle made by a mysterious man.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

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