Only known mainland rookery of the threatened Stellar sea lion.

Treehouse motel and treehouse-building school.

This charmingly homemade amusement park has been growing for 40 years.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

Experience Larry Spring's self-taught "common sense" laws of physics.

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

A humble garage, world-famous for being the epicenter of a technology revolution.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The best place in the park to test out your throwing arm.

The black lab that was voted mayor of a California town is forever remembered by a life-size statue.

This giant head is all that remains of a once proud statue that survived an earthquake but not a fall off of a wagon.

This giant temperature attraction created some giant electric bills.

A monumental cross hides in the trees in Golden Gate Park.

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!!

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

An enormous illuminated figure dances on the Las Vegas strip.

A stunning landscape of bunkers that once stored chemical weapons.

This extinct shield volcano is the lightning rod of the Cascades.

This sculpture garden in Death Valley makes you feel like you've slipped into some alternate reality.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."