Visible below the waves are memorials to the city's Gold Rush dead.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A huge musical instrument played by the ocean.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

A graveyard for early settlers, sometimes called Old Pioneer Cemetery, hidden in the woods on a hillside.

The longest and widest floating bridge in the world.

This sci-fi gazebo located in a Washington power town is made from old bits of industrial electrical equipment.

"The Reptile Man's" very own roadside zoo features an albino alligator.

This unique Seattle structure was designed to be the greenest commercial building on the planet.

The tiny church offers succor to travelers driving by, but only eight at a time.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

This jazz venue welcomes performers nightly and students daily.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

A surreal landscape where fanged rocks rise from the ground and the ocean feels like a great mystery.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Shoreline strewn with the remains of ghostly fallen trees.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

This stately Victorian-era burial ground overlooking the Pacific Ocean is home to the graves of some of British Columbia's most famous figures.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.