World's first "penitentiary," meant to be humane, drove men insane.

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

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

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.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This huge clock made of flowers and simple machinery was once used a political weapon.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

A medical facility that has been kept frozen in time.

There has been an astronomical clock on this spot since the 14th century.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Giant topiary dog once played a role in a terrorist bomb plot.

One of the few surviving "Wigwam"-themed motels.

Prehistoric animals decorate this popular outdoor park.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

The world's longest known cave system.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

The remains of this visionary community can still be found much as it was a century ago.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

A life-sized memorial to Harry L. Collins, the official corporate magician of Frito-Lay.