Colorado's only active volcano last erupted around 4,000 years ago.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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

Colorado's only true geyser is hidden within the San Juan National Forest.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

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

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

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

A secret climbing tree hides along the side of a Costa Rican road.

Costa Rica's best known combat zone, used during the Battle of Santa Rosa.

This Costa Rican chapel is the most metal church in the world, literally.

Disused penal colony features prisoner artwork, some sketched in human blood.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

Sloth rehabilitation center in the jungle of Costa Rica.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Dine inside a giant caterpillar at this community-run eatery.

Frequent fliers welcome in this airplane hotel.

This abandoned hospital is one of the most haunted places in Costa Rica.