The longest continuous lava tube in Oregon.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Massive still life just off the highway in Kansas.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

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.

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

An architect's childhood fantasy treehouse made real.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The first declared National Monument in the United States.

A beautiful geyser under environmental threat.

A tiny art gallery in Sunnyside helps keep Portland weird.

A vertically floating hemlock controls the waves and weather at Crater Lake.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

Only known mainland rookery of the threatened Stellar sea lion.

The magic's in the hole!

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This free, take-a-book shop seems like a trick but isn't.

A dollhouse full of taxidermy rodents, each one handcrafted and given a sordid past.

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.