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.

The first declared National Monument in the United States.

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

A classic mystery spot complete with spots that are said to make you shrink or grow when you stand on them.

The highest point in Montana is as rugged and singular as the state itself.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The only road through the heart of Glacier National Park.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

New fungal and bacterial species call this deadly lake home.

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

A river runs through this remote valley in a very unexpected way.

Unlike most arches, this geological oddity formed in a volcanic dike.

16,500-acre ranch filled with American heritage, geological wonders, and a giant pile of tires is the crown jewel of an intriguing tug-of-war.

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

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

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

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

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

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.