One of the largest Native American shell middens stands 30 feet tall.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

An autonomous oak in Alabama.

Crumbling Kennedys and a decaying Tecumseh are just some of the haunting remains of one man's cement art trail.

The cluster of boulders near Fort Irwin is covered in military insignia.

An early-19th-century hotel with a past that is steeped in the Civil War.

The only subterranean ping pong table in Atlanta.

A historic dam made famous for its turbines and feature in a Hollywood classic.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

This magnificent, quirky home sits atop a literal gold mine in the middle of the Nevada desert.

The building stands within a quiet, postcard-perfect New Mexico village.

A few dilapidated structures are all that remain of this deserted former silver mining town.

Ethereal alien hums and haunting whale songs emitting from...a giant sheet of vibrating metal?

America's smallest town is run by its single citizen/mayor/librarian/bartender.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

A nourishing complex of found object art, paintings, and sculptures that celebrate key figures in Black history.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

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

Art Deco urban decay at this historical building.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

Mariners once used this prehistoric landfill as a navigational landmark.