At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

San Francisco's first World's Fair, dedicated to the wonders of California.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

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

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

Golden Gate Park's historic collection of plants.

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

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

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

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

This turn of the century masterpiece has a mysterious goaty interloper.

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

A famous alternative culture epicenter and where Joplin serenaded young hippies.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

Only hotel where you can legally launder money.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A tree grown from astronaut seeds which were exposed to cosmic rays.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

A massive volcanic plug is now a protected area that hosts a number of bird species.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.