An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

Essence of hound's tongue and tincture of bloodroot are just the tip of the herbalist iceberg at this beautiful, impressively-stocked apothecary.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

An extraordinary mixture of natural beauty and man-made phenomena.

Couple's personal collection of pinball machines turned public pinball museum.

Rustic natural hot springs in the deciduous rain forest.

A house filled to the brim with oddities and curiosities.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A giant Troll lurks under one of Seattle's oldest bridges.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

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.

Hollowed out cedar log tubs set in an ancient towering forest.

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

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

On the Oregon coast there is a natural hole that seems to be draining the sea.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.