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

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

A modest reminder of treacherous waters at the Golden Gate.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

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

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

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

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

Guns that have been defending San Francisco since 1904.

Once the site of speeding horses, now home to picnickers and public concerts.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

A monument to the love people have for their pets.

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

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A quiet marker in memory of local men and women lost in WWI.

Golden Gate Park's historic collection of plants.

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

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

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

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