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

The largest source of fossilized insects anywhere.

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

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

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

When ecosystems collide in the arid Southwest.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

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

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

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

The Grand Canyon of Texas.

Free public park and gardens filled with peacocks and peahens.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A grove of colossal man-made flowers built to collect the sun's rays.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

This failed condo development was reborn as a street art hub.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

Home to Hollywood history and a very special salt crystal.