A hidden subterranean installation offers a view of the sky.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

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

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Tiki luxury on Nob Hill.

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

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

Its buzzing collection honors vibrator history.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

The ghost town that ended up on Ebay.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

This simple highway curve has become a comedic pilgrimage site.

The Hopi-style structure was built by the man who discovered Desert Hot Springs' famous mineral water.

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

You don't have to be a diplomat to visit the so-called Camp David of the West.

An artist's vision for connectivity spans seven continents and 16 countries.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

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