A memorial to an ill-fated Holy Land mission once described by Mark Twain as “a complete fiasco.”

This rural island is home to the ghost town of what used to be the world’s biggest salt mine.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Built in 1925, this glass-roofed shopping arcade is known for its modernist Italian architecture.

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

A historic, scenic mill that was forced to close due to overlogging.

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

One of the deepest springs in Missouri.

Site of the 1926 murder trial of Ernest Burkhart who was involved in the "Reign of Terror."

A tiny but mighty little pumper sits in the middle of the street, waiting for the next big oil strike.

A large stone map of Arkansas awaits visitors to its highest point.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

Nature's biggest mammal swims in landlocked Oklahoma.

Giant papier mache hog sits on private property.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

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."

The largest spring in Northwest Arkansas is also home to a sprawling botanical gardens and a historically significant bluff.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

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.

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

First crafted during the 19th century, the mill was fully restored in 1983.

This classic Kansas City song reference is the place for anyone who wants to stand at the corner of 12th Street and Vine.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.