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

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Man-made geyser that rises to the exact height of the Gateway Arch.

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

An extensive collection of fine art devoted to man's best friend.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

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

An oddities shop packed with twisted treasures inspired by Oscar Wilde and Edgar Allan Poe.

The final resting place of an outlaw, whose legend grew after death.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

The only museum dedicated to the history of the "Magic Lantern," a medieval slide projector.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

The cremains of those who donated their bodies to science are buried in a tiny cemetery behind the building.

For over 75 years, this cute stone statue has warmed the hearts of San Antonio.

San Antonio's first 3-D stereoscopic mural is a trippy treat for the eyes.

An antique horse-drawn hearse provided French luxury for the dead in this Texan town.

Soldiers honored the beloved Pat with a special grave.

The wood bears a hidden love note carved by a young Johnny Cash.

Two small markers remember the Alamo's feline protectors.

Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A 131-year-old wunderkammer of Texas history.