The air force base preserves its scars from the Japanese attack on Pearl Harbor.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

One of only two commuter aerial tramways in the United States.

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Once America's tallest structure, now a Baltimore landmark.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

Famously misunderstood wonder of the ancient world

San Francisco’s century-old Christmas Tree.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

Only hotel where you can legally launder money.

Faceless white figures loom over the city from the rooftop.

The only visible piece of San Francisco's most famous shipwreck.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

One of few lasting examples of the brief octagon craze that developed into folly.

The miraculous hydrant that saved the Mission District in 1906.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The remains of a ruined mansion memorialize the 1906 earthquake.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

It is locally loved and ridiculed for literally looking like poop.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.