Minnesota's oldest and deepest mine is now an underground physics laboratory.

New fungal and bacterial species call this deadly lake home.

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.

Mining town from the late 1890s, once home to Calamity Jane.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

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

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

This super steep hike ascends 2,000 feet in less than a mile.

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

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

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Outsider Art Community.

When ecosystems collide in the arid Southwest.

A spiritual vortex among the red rocks in Sedona.

Legends surround this jagged rock formation in the New Mexico desert.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.