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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

Guns that have been defending San Francisco since 1904.

A living time capsule of the 1960s Richardson Bay water-front.

Dive bar built out of the remains of a whaling ship.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A memorial to the firefighters who died in an industrial disaster is housed in a small public park.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

The self-proclaimed gateway to the Extraterrestrial Highway.

These markers are used to determine the ground stability of the Strip.

This sign designates the road that leads to the infamous Area 51.

Mysterious meeting place for UFO hunters near Area 51.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

An eatery for UFO seekers on the Extraterrestrial Highway.

Don't blink or you'll miss it.

The world's largest military aircraft cemetery.

The first permanent memorial to a unique secret weapon of World War II.

America's only nuclear missile silo open to the public.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The world's first invisible city square is an homage to a man who pushed the boundaries of art.