California's first suspension bridge.

This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

A highway marker that honors a former spy plane pilot and local hero.

No monkeying around, this fountain was really named after the classic sci-fi film.

A 10-foot-tall concrete Alley Oop statue left over from World War II now stands on the side of the road.

A source of civic pride, though the reason for its construction is unknown.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

This memorial includes fragments from one of the greatest tragedies in United States history.

The last SR-71 ever constructed.

The oldest original lighthouse in Alaska that was born out of a tragic shipwreck.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

From golden eagles to peregrine falcons, this rehabilitation and education center is a haven for birds of prey.

This giant tower beacon was a key navigation tool for pilots delivering mail amid the night skies.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

The U.S.' first commercial park dedicated entirely to flying drones.

This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

One of the last socialist halls still standing in the United States.

Don't bother sending any mail to this ghost town.

This outdoor exhibit features a historic wooden dam once used to help boats navigate the Ohio River.

These mysterious ruins are hidden amid this sleepy coastal city.

Known as the “Official Greeter of Juneau,” this dog still welcomes ships and their passengers to Alaska.

Jimi Hendrix's legendary recording studio in Greenwich Village.

This abandoned radar site is slowly being taken back by the jungle, its mission cut short by the end of the Cold War.