This church on a Tohono O'Odham reservation has stood since 1797.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

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

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

A long and winding trail through history led to the current iteration of this mountaintop tower.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

A museum devoted entirely to the rattlesnakes and snake-related art.

Take a self-guided tour through one of Colorado's most elevated mining districts.

This historic boathouse was constructed using salvaged lumber from burned barns.

This estate on the banks of the James River was home to a Founding Father, two presidents, a famous bugle melody, and what some say was the actual first Thanksgiving.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

A little-known hot spring haven right below the highway.

A frozen oasis lies beneath the scorching New Mexico desert.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The world’s largest concentrated solar plant generates as many problems as megawatts.

This giant temperature attraction created some giant electric bills.

Thousands of turbines whir at at the origin of North American wind power.

This magnificent, quirky home sits atop a literal gold mine in the middle of the Nevada desert.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

A home covered with elaborate mosaic and other pieces of art.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

When this 160-year-old church was being built, a stonemason included a hidden homage to his late daughter.