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

This historic railroad hotel built from Kansas limestone was once the most popular hotels for traveling salesmen in the midwest.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Experience a charming 1930's version of "infotainment."

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A remote crossroads honoring a fallen talent.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

This hidden fire lookout offers spectacular views of Sequoia National Park.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

Art Deco stylings conceal the true nature of this bridge.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

An outsider art studio that created a piece of work so popular they had to turn mainstream.

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

A home designed to be on the cutting edge of comfortable, low-cost living.