In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

This is one really big nut.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

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

Take a dip in the world's largest mineral hot springs pool.

A multiversal transit station located right below a highway interchange.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

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

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

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

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

A downtown park built on top of unclaimed graves.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

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

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

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