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

Over 315,000 preserved amphibians and reptiles in jars.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

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

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

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

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

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

The only theatre in the world constructed specifically for sound movement.

This shop specializes in oddities and Victorian-inspired wonders.

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

A psychedelic labyrinth on the San Francisco bay.

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

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

A strange house built only at night, with rumored mystic inspiration.

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

Get up close to emus and ostriches, or buy their tasty meat.

California's oldest wind harp represents a historic piece of America's Danish history.

This nonsensical smiling boat shuttles passengers between two places they could've easily walked between.