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.

Olfactory delights in San Francisco's Botanical Gardens.

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

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

Its buzzing collection honors vibrator history.

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

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

A huge musical instrument played by the ocean.

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

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

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

A 140-year-old castle with underground caves hidden in San Francisco.

A psychedelic labyrinth on the San Francisco bay.

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

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

An exhibit dedicated to a Lithuanian partisan.

A WWII museum that tries to reenact history.

The first museum dedicated to exploring humanity's cultural relationship with the celestial world.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

This lonely Lithuanian chapel looks more beautiful and haunting in decline than it ever did in life.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

Underwater roads undetectable from the surface used for escape routes from foreign invaders.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.