The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

The first declared National Monument in the United States.

A working ranch doubles as a sustainable hub for world-renowned classical music and large-scale sculptures.

Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

The highest point in Montana is as rugged and singular as the state itself.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

These giant metal horses graze on a hilltop near the Montana highway.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

World's only nuclear reactor operated by liberal arts undergraduates.

Portland had a unique approach to Cold War-era protections.

A sculpture of a salmon swimming through a brick building.

Mountain known by the Tillamook Tribe as "the place of the supreme deity."

A fine, large-aperture telescope available for public use.

Instead of fruit, the branches of this tree are brimming with hopes and dreams.

Entering this curiosity shop is like stepping into a mad scientist's lab.

A beautiful 62-acre Catholic shrine and botanical garden.

A midcentury ranch house hides a literal treasure trove of unique rocks and minerals.

This former mining hub holds a surprising abundance of undisturbed relics from the Old West.