A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

Only hotel where you can legally launder money.

A man-made island in scenic San Francisco Bay.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An essential stop before plundering, BYO Cutlass.

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

San Francisco's newly reopened hands-on science museum.

Tiki luxury on Nob Hill.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

This historical Netherlands fortress still bears the marks of its single siege.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

A museum dedicated to the alleged Roswell Incident.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

These boots are made for selfies.

A fruit-loving town welcomes visitors with a giant melon set against the sky.

The world's largest squirrel statue clutches a pecan bigger than your head.