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

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

A wax effigy of St. Valentine hides one of the saint's relics.

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

A notorious Route 66 eatery once frequented by Al Capone.

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

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

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

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A museum dedicated to man's boldest venture.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Erosion and time have created a naturally-formed water park.

The only pig museum in the U.S. holds one of the world's largest collections of pig items.

The history of funerals and funerary customs.

Taxidermy, Cigar Store Indians, A Model of a New York Tenement and Delicious Draft Root Beer.

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