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

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

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

Central City celebrates its most famous madam by racing beds down Main Street.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

Neal Cassady may still have an open tab at one of Denver’s oldest watering holes.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

This Chinese-style quartz sundial was saved in its final hour.

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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A mental health hospital dating back more than 139 years, now features a museum.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

The clock that sets them all.

A bizarre house filled with an astounding array of collections.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

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

America's largest man-made forest was planted in an effort to bring back the past.

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

An experimental, automotive replica of Stonehenge.

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.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.