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

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

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

Curious cave that stays a cool 56 degrees all year long.

Most comprehensive museum in America devoted to one ethnic group.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

Community bookshelf of 25-foot-tall book spines.

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

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

A bizarre house filled with an astounding array of collections.

The oldest university museum west of the Mississippi retains its 19th century feel.

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

Home with Gothic windows featured in a famous painting.

This Mediterranean castle was built for a millionaire and his giant dog.

A snapshot of the city's fascinating voodoo culture.

The second oldest continuously operating bar in Louisiana.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

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

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

European castle ruins in an American state park are actually the product of death and grief.