The man who was president for only one day and spent most of it asleep.

The headquarters of the prestigious World Food Prize celebrates the heroes in the fight against hunger, has no cafeteria.

This historic cliffside mansion uses a natural cave for air conditioning.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

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

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

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

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

Collection maintained by the legendary designer.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

A ghost town revived by hippies and wanderers throws its own special brand of holiday parade.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.