The world's longest known cave system.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

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

A chessmaster's dream destination.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

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

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

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

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

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This replica of the Greek structure is in the heart of Nashville.