Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Site of the greatest known waterfall that ever existed.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

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

The site of the Wellington avalanche, one of the America's worst railroad disasters.

A nondescript Seattle restaurant inherited a piece of European history.

A home made entirely from scrapped, reclaimed and recycled material in Whitman County, Washington.

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

Tour the original street level of Port Angeles, buried underground in 1914.

Shoreline strewn with the remains of ghostly fallen trees.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

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

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

The first park built over a freeway is a brutalist masterwork.

An obscure waterfall that looks like something out of a fantasy novel.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

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

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

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

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

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

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

A whimsical village of unique treehouses resides in a Washington forest.

Stroll through a wonderland of stupendous moss-covered trees.