A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

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

A 300-ship graveyard, with a few still visible at low tide.

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

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

Guns that have been defending San Francisco since 1904.

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

A miniature view of the park, caught in time.

Standing in for the first ship to navigate the Northwest Passage.

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

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

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

Once the fastest ship from San Francisco to Tahiti, the Galilee now lays in pieces in three different cities.

A celebration of once forgotten materials.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

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

A monumental cross hides in the trees in Golden Gate Park.

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

Floating man-made island and upscale restaurant.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

A hidden subterranean installation offers a view of the sky.

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

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

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