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

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.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

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

A massive sea stack famous for its appearance in The Goonies.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

An ancient Egyptian temple in the middle of Madrid, Spain.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

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

What do a giraffe, an elephant, and reasonably priced steaks have in common? This roadside restaurant filled with exotic taxidermy.

The first declared National Monument in the United States.

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

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

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

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

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.