These subterranean storage areas hold emergency water reserves.

An essential stop before plundering, BYO Cutlass.

A modern mechanical planetary system, part of a 10,000 year clock.

California's most comprehensive horticultural library.

Art in the form of a winding, man made crack in stone.

A hidden subterranean installation offers a view of the sky.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

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

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

Golden Gate Park's historic collection of plants.

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

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

A century and a half of research in the sciences and natural history, still going strong.

This private residence was the template for one of the most beloved television homes of all time.

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

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

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

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

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

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

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

This painted marvel is San Francisco's 400-foot ode to urban biking.