A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A monument at the site of the Towner School Bus Tragedy, which lead to changes in school bus safety.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

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

“You better take care of me Lord, if you don't you're gonna have me on your hands.” ― Hunter S. Thompson, Fear and Loathing in Las Vegas.

A miraculous natural phenomenon known as "the spring that breathes."

The first declared National Monument in the United States.

Native Americans built this circle of stones, which was used to predict astronomical events.

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

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

This gorgeous, colorful 18th-century church is part of one of Bolivia's few surviving Jesuit missions.

A public display of prehistoric space rocks is named for the Namibian village where they were found.

Survival capsules find a second life as a unique hotel.

The world's first interactive human body museum also serves as a chair for a giant orange man.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

The king of U.S. high points towers over every other peak on the continent.

A hidden tunnel of bones in one of Malta's oldest churches.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.