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

The drama of nature in full effect in this Nevada State Park.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

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.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

This monument remembers one of the manliest men of the frontier who fought a grizzly before dragging himself 200 miles to safety.

The first declared National Monument in the United States.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

A fitting attraction for the corn capital of the world.

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.

Concrete strongholds stand guard over the Golden Gate.

This historic toy museum brings a little whimsy to a city not usually remembered for such things.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

A 300-ship graveyard, with a few still visible at low tide.

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

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

Furniture tries to escape an abandoned building in San Francisco.

A large instrument played by the wind.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.