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.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

This otherworldly church spire reaches up toward the heavens.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

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

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

This abandoned prison castle has become an imposing gallery of graffiti art.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.