This pristinely abandoned filling station on the edge of a graveyard is populated solely by unsettling mannequins.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

One of America's first planned communities is preserved in a state park.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

A Hawaiian stairway to heaven—that you can't climb.

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

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

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

An acoustic anomaly with a mysterious cause.

The Ozarks' strangest dwelling.