The remains of the dam that unleashed a 15-foot wall of water on Denver.

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.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

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

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

There are eight natural springs around town, each with a slightly different taste.

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

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

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

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

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

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

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

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

An extensive collection of ancient Egyptian artifacts and mummies.