The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

Singing sand that stands as the final remains of an ancient lake.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.

A Nevada mining boomtown that ran out of silver and luck.

The current Eureka County Courthouse replaced an all-wooden structure that had previously been an ice-skating rink.

Only intact Ichthyosaur skeleton in the United States.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

The drama of nature in full effect in this Nevada State Park.

This sun-scorched lakebed contains samples of half the natural elements known to humankind.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

The remains of the first public diamond mine in Arkansas.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

The brainchild of Eleanor Roosevelt, her "Little Village" was a collectivist dream.

First planned industrial community in the United States.

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

The Citrus Variety Collection at UC Riverside contains two trees of each of the 1,000+ varieties of citrus.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.