A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

An essential stop before plundering, BYO Cutlass.

Tiki luxury on Nob Hill.

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

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

Olfactory delights in San Francisco's Botanical Gardens.

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

A museum befitting the city responsible for supplying the majority of the world's LSD.

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

This shop specializes in oddities and Victorian-inspired wonders.

A psychedelic labyrinth on the San Francisco bay.

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

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

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.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The Tudor-style cottage in the middle of the square is not quite what it seems.

This studio was home to David Bowie's first single, even if it did turn away the Beatles.