One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

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

An eclectic assortment of medieval architecture in a small Iowa town.

Spectacular views await visitors to this lake.

The only road through the heart of Glacier National Park.

The largest outdoor art gallery in the Northwest United States.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

A house carved into a rock in the 1940s.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

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

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

Wander through desolate oil fields littered with rigs.

Remnants of the United States's largest accidental oil spill still mar a California valley.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

This former coal gasification plant found a curious second life as a popular public park.

An eclectic restaurant serving from and to the nearby Chittenden Locks.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

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

The original span of a high bridge across the deep Crooked River Gorge has been preserved for pedestrian use.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.