A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

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

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

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

Its buzzing collection honors vibrator history.

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.

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

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

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

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

This eatery transports diners to a place that no longer exists: East Germany.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

Once the gateway to the utopian dream-village of a Civil War embalmer.

Social saloon from a scrapped trans-Pacific 19th century steamer.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.