Site of the greatest known waterfall that ever existed.

Every drop of water in this 27-mile long reservoir was pumped up from the Columbia River using power from Grand Coulee Dam.

A museum chronicling pioneer life constructed over Interstate 80.

This erect, phallic geological spire wasn't always named so domestically.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

One of the oldest continuously operating amusement parks in the U.S. is an open-air museum of Art Deco and neon lights.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

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

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

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

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

This enigmatic building features numerous architectural styles.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

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