Natural rock water slides hidden in the remote forests of northern Idaho.

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

This oddity shop contains everything from antique tools to a human skeleton.

It was once used as a classroom to teach mining skills to local high school students.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

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

Treehouse motel and treehouse-building school.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

Stepping inside this coffee shop is a journey through time.

A sprawling cave network created by a lone lava tube.

An old World War II hangar holds 20 vintage aircraft and the rare opportunity to take a ride in a 1940s warbird.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The wooden airship was the largest flying boat ever built.

The largest wooden building in the world now houses a fascinating collection of aircraft.

This natural marble cave is one of only five national monuments in Oregon.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

Home of Howard Hughes' Spruce Goose.

Where Nor'easters go to die.

A tourist attraction founded around a slumping cabin.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

The longest continuous lava tube in Oregon.

This charmingly homemade amusement park has been growing for 40 years.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

This frequently-photographed waterfall takes only a short hike to visit.