Spectacular 300-foot cliffs in a lush mountain canyon.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The hallowed ground of one of the worst atrocities in United States history.

A brick-paved former section of the historic coast-to-coast highway.

Haunted dolls, macabre artifacts, and more make up the collection of the “most haunted museum in the world.”

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

With over 5,000 champions, the Hall of Fame continues to draw amateur eaters.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

One of the world's earliest skyscrapers.

Less a museum than a bizarre fantasy world created by artists and engineers.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

An urban forest overtakes what was the greatest failure of utopic urban housing.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

In a historic steel foundry east of the Mississippi River, thousands of wooden crates hold the architectural remnants of buildings long gone but not forgotten.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

A frog crossed this road, but whether it made it to the other side remains a mystery.

A sculpture of a giant man escaping from the depths of the Earth.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.