The world's only museum devoted to the wonders of fluorescence.

The world's longest known cave system.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

These memorials built by an eccentric bachelor on the side of Interstate 5 cause both wonder and traffic accidents.

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

See the imprints of ancient trees, burned and preserved by lava.

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

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

A heavenly experience, right here on Terra Firma.

A beautiful 62-acre Catholic shrine and botanical garden.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

A world of craftwork elegantly curated in a historic brick warehouse.

Portlandia is the second-largest copper repoussé statue in the United States.

The magic's in the hole!

A historic hotel with many stories of haunted activity.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.

A comprehensive collection of bonsai set in a beautiful campus.

This 22-acre botanical garden is home to the largest collection of rhododendrons in the world.

A former Catholic seminary, now a Washington State Park, preserves undeveloped lands on Lake Washington and also hosts a luxury hotel.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

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

Browse through roughly 130,000 titles in the world's largest independent video rental store.

An ice cream parlor chain that caters to vegans and pinball fans equally.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.