This abandoned boat was left in place thanks to its rotting beauty.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

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

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A comprehensive collection of Pez dispensers.

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

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

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Tiki luxury on Nob Hill.

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

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

Olfactory delights in San Francisco's Botanical Gardens.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A psychedelic labyrinth on the San Francisco bay.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

A huge musical instrument played by the ocean.