A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

A private home collection of more than 3,500 cat figurines.

The last remaining bottle-shaped kilns in Scotland stand alone in an Edinburgh suburb.

A library where thousands of books explain how to avoid another Great Recession.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

The Bong-area park police have asked visitors to please, stop stealing the signs.

A wonderfully curated used bookstore in an airport.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Everything in this miniature world was handmade from matches, paperclips, wires, tin cans, and other everyday objects.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

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.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

One of the deepest springs in Missouri.

Where the author wrote her beloved "Little House" books.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

An extravagant western hotel where every floor is the "ground floor."

This restaurant serves wood-fired fare served in a natural cave with a live spring.

A 40-foot waterfall flows into this unique natural swimming hole.