Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

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

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

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

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

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

Home of the International Space Hall of Fame.

High in the Sacramento Mountains, a facility dedicated to studying the sun.

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

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

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

Meet Rita the Rock Planter, one of Danish sculptor Thomas Dambo's enormous wooden trolls.

The highest bridge in America was built for an almost unnervingly small amount of money.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

Dance on a hand-hewn log floor padded with bouncy boxcar springs at a saloon built in 1883.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

One of the smallest towns in the United States.