The only diamond mine in the world where you can keep what you find.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

Community bookshelf of 25-foot-tall book spines.

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

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

This abandoned prison castle has become an imposing gallery of graffiti art.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

A flat slab of stone perched hundreds of feet above the Gasconade River in the northern Ozark mountains.

This Kansas City studio was home to Walt Disney's first animation business.

This museum presents a dogged pursuit of 500 years of veterinary history.

A museum devoted to osteopathy and its creator, Andrew Still.

The only remaining Cold War–era Minuteman II missile control center in Missouri.

This mansion was made famous by its colorful cast of owners and location along the Sante Fe Trail.

A Mormon place of exile in Missouri.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

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

One of America's first planned communities is preserved in a state park.

Thousands of small machines line the shelves of this personal collection which definitely delivers on its name.

Who said a biker bar is no place for a taxidermy squirrel collection?

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