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

A colorful architectural gem in Seattle’s uniquely modern Central Library.

Seattle's own bad art museum located inside Cafe Racer.

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

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

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

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

Stroll through a wonderland of stupendous moss-covered trees.

The World's First 24 Hour Coin-Operated Art Gallery!! Plastic, Styrofoam, and Elvis--If you can't get rid of it, you might as well worship it!!

Taking the 3D art experience far beyond blue and red glasses.

The home of the world's first and last remaining "wooly ant."

These machines have been collecting dust for decades.

This Portland shop is brimming with natural wonders, local art, and handmade goods fashioned from recycled materials.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

A delightfully quirky blend of oddities spread throughout an old 1920s bank.

Their motto is, "We've been bonkers for hats even longer than you have!"

Along the Outback Scenic Byway, adjacent to hot springs, this human-made geothermal feature takes unexplained breaks.

A tribute to a unique bike race that takes place every year.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

A ghost town in a remote corner of Oregon hosts a touching tribute to Sacagawea’s son.

A brief journey through early 19th-century pioneer life across Linn County.

This 80.33 troy ounces of solid gold is believed to be the largest nugget from Oregon still in its original form.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

A small, fascinating fire museum hidden in plain sight in an administrative building.