An auroral research program that superheats the ionosphere.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

A copy of the famous bus used during the filming of 'Into the Wild' is on display at an Alaska brewery.

You might want to bring a rain jacket to this travertine triple waterfall.

Even in death, he's still your huckleberry.

Take a dip in the world's largest mineral hot springs pool.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Hike, ski, or snowshoe to a backcountry yurt that serves up gourmet, four-course dinners.

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

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

This enigmatic building features numerous architectural styles.

This super steep hike ascends 2,000 feet in less than a mile.

There are eight natural springs around town, each with a slightly different taste.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

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