The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

When ecosystems collide in the arid Southwest.

Community owned and operated, this property is home to a diverse set of nudists.

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.

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

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

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

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

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

The largest source of fossilized insects anywhere.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

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

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

A little-known hot spring haven right below the highway.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.