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

Birdhouses, peacocks, animal sculptures, and a graveyard are all found along this eclectic nature trail.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

A modest reminder of treacherous waters at the Golden Gate.

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

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

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

Only hotel where you can legally launder money.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

One of the first skyscrapers in Santa Monica, and a famous getaway for the Hollywood elite of then and now.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

The magic's in the hole!

This natural marble cave is one of only five national monuments in Oregon.

A sculpture of a salmon swimming through a brick building.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

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

The largest outdoor art gallery in the Northwest United States.

The final resting spot of the Colorado Transportation Department's beloved unofficial mascot.

An experimental, automotive replica of Stonehenge.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

The remains of the dam that unleashed a 15-foot wall of water on Denver.