When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This building is a recreation of the gatehouse that separated Los Alamos from the outside world during the era of the Manhattan Project.

This old ruin once served as a post office, a train station, a restaurant, and a bridge to the Atomic Age.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

A natural formation that resembles a camel resting in the New Mexico desert.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This high desert botanical garden is a unique display of New Mexico’s ecology and culture.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This is one really big nut.

Legends surround this jagged rock formation in the New Mexico desert.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

One of the 20th century’s most famous businessmen is buried in Houston’s most prestigious cemetery.

Joseph and Victor Stanzel were Texas farm boys who built a model aircraft empire.

Whether or not you take the 72-ounce steak challenge, there’s plenty of history, fun and Texas-style food at this legendary stop along Route 66.

Despite changing times, the legendary stage has proved the show must always go on.

Welcome to a starkly beautiful sanctuary where the buffalo roam.