A tunnel with windows, so you don't miss out on the impressive views.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Three nine-foot-tall bathing beauties perched elegantly on life-rings welcome visitors to the Alki waterfront.

The highest point in Washington state is a volcano covered in glaciers.

Stroll through a wonderland of stupendous moss-covered trees.

This soaring sculpture and Sioux Falls landmark represents the leap of faith taken to make one's dreams come true.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A fitting attraction for the corn capital of the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

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

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

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

Spectacular views await visitors to this lake.

This working class sculpture pounds his hammer all the livelong day.

A wall of chewing gum moonlights as collective art.

This former coal gasification plant found a curious second life as a popular public park.

A museum dedicated to the history and exploration of both popular music and science fiction.

A walk through the historic city center, under the streets of Seattle.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.