This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

A porcelain company's former dumping ground, completely covered in pieces of collectible ceramics.

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.

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

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

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

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Rumor had it that these concrete crosses scattered across the Arizona scrubland helped align spy satellites. (They didn’t.)

A bibliophile's heaven that contains hundreds of bookstores, offering over a third of secondhand books for sale in Tokyo.

Over 100 lasers, including huge ones that look straight off a sci-fi set.

The exit of the largest prisoner-of-war escape attempt on American soil during World War II.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

Spiral labyrinth hidden in the hills above Oakland, CA.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

Where a demonstration led to equal rights for one of California's most marginalized communities.

A hidden subterranean installation offers a view of the sky.

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

San Francisco's first World's Fair, dedicated to the wonders of California.

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

This bronze statue commemorates the strange and beloved mascot of UC Irvine—the only university to be represented by a giant anteater.