A free, public museum dedicated to the fascinating science of sight.

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

Early prototype for Frank Lloyd Wright's Guggenheim.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

The remains of a 12th-century chapter house in Golden Gate Park.

Half of a house.

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

A monument to the love people have for their pets.

A library and museum dedicated to typography.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A promotional sun clock on the site of San Francisco's great raceway.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

This print shop boasts one of the largest pinball arcades in San Francisco.

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

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Gold Rush-era tombstones line the park's paths.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

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

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

A hidden subterranean installation offers a view of the sky.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.