A sobering scientific reminder of the human damage caused by the advent of the nuclear age.

The giant figure on the back of this turtle-shaped temple actually hides a memorial pendulum.

The largest volcanic caldera in Japan holds an entire city in its maw.

The iconic castle that withstood a magnitude 6.2 earthquake has become a symbol of resilience.

The secret city built by the Manhattan Project.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

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

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

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

A classic carnival ride that was carved to be untouchable.

A smoke stack so large, the Washington Monument could fit inside!

The shortest river in America flows for just 201 feet.

"Polynesia on the Plains."

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.

A popular rock that acted as a waymarker for American pioneers.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

One of the smallest towns in the United States.

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

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

The first declared National Monument in the United States.

A beautiful geyser under environmental threat.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .