The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A museum dedicated to the alleged Roswell Incident.

The first declared National Monument in the United States.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Fossils, railroads, and waterfalls!

Few other hotels can rival the grandeur of the Castle in the Rockies.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The only road through the heart of Glacier National Park.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A beautiful geyser under environmental threat.

See massive fossils that are over 200 million years old in northeastern Arizona.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Granting the right of way to ships over surface traffic since 1917.

A giant Troll lurks under one of Seattle's oldest bridges.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A walk through the historic city center, under the streets of Seattle.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The magic's in the hole!

Portlandia is the second-largest copper repoussé statue in the United States.

The ghostly remains of an accidental sea.