Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

The first declared National Monument in the United States.

An experimental, automotive replica of Stonehenge.

This erect, phallic geological spire wasn't always named so domestically.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

A winding path built in secret on the edge of the continent.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Every president in history is immortalized in bronze in downtown Rapid City.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Olfactory delights in San Francisco's Botanical Gardens.

The remains of a 12th-century chapter house in Golden Gate Park.

Golden Gate Park's historic collection of plants.

A huge musical instrument played by the ocean.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Concrete strongholds stand guard over the Golden Gate.