A monument to the egos of two railroad magnates that fell into decline along with their careers.

The only retired U.S. nuclear missile silo that is open to the public.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

The remnants of the base where US Army troops learned how to fight in extreme conditions.

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

A hotel with a rich Wild West history of miners and bootleggers.

The decaying ruins of a failed mining company’s water diversion project cling to the side of a desert canyon.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

A coal fire has been burning underground here since 1896.

The final resting spot of the Colorado Transportation Department's beloved unofficial mascot.

This 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

It's easy to forget what century it is as you wander this rustic homestead.

This sidewalk tribute honors Colorado's great culinary creation.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.