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

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

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

The largest source of fossilized insects anywhere.

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

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

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

Colorado's only true geyser is hidden within the San Juan National Forest.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

The largest self-built castle in the U.S., six decades in the making.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.