A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

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

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

A 140-year-old castle with underground caves hidden in San Francisco.

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

A huge musical instrument played by the ocean.

San Francisco’s condensed garden of incredible plant growth.

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

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.

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

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

A man-made island in scenic San Francisco Bay.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

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

The miraculous hydrant that saved the Mission District in 1906.

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

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

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

A winding path built in secret on the edge of the continent.