This geothermal hot spring hides beneath a slowly growing mineral dome.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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.

See just what life was like in a 19th-century prospecting town.

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

This museum glorifies the humble potato.

A few dilapidated structures are all that remain of this deserted former silver mining town.

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

After this former brothel closed, its interior remained almost frozen in time.

This landmark is a central figure in the Nez Perce origin story.

An Idaho legend carved out a cave village with his own two hands.

A museum has some wedding cake dating to the Teddy Roosevelt administration, and some bacon from FDR's.

This giant ice cream cone is the last remaining icon of a Salt Lake City staple.

In this subterranean brick arcade, a small shop continues the ancient practice of bookbinding.

A collection of odd-shaped and quirky sounding instruments handmade by a midcentury inventor-composer.

An allegedly haunted mansion with a tragic, tawdry past.

This graveyard contains markers and monuments dedicated to some of the darkest chapters in Washington's history.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

The flock of plastic poultry is an ode to the classic comedy staple.

This Seattle store is packed with all sorts of curious creatures and creations.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.