Olfactory delights in San Francisco's Botanical Gardens.

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

Its buzzing collection honors vibrator history.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

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

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

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

A huge musical instrument played by the ocean.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

Steadily reminding Czechia of its past.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

This doorless 20th-century elevator doesn't stop or slow down.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The first museum in the world devoted to sexual gadgetry.

This automated sculpture of two men peeing will spell out text messages with their micturition.