A Mars simulation in the southern Utah desert.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

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

An abandoned 19th-century hospital now swirling in ghost stories.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

The highest point in Washington state is a volcano covered in glaciers.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Despite its name, this route in southern Utah offers a heavenly day trip.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.