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

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

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

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

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

Its buzzing collection honors vibrator history.

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

This shop specializes in oddities and Victorian-inspired wonders.

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.

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.

A huge musical instrument played by the ocean.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

An unusual manor of stunning beauty, born out of a crippling disease.

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

Modern sundial uses ancient methods to tell time and date perfectly.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A hugely vast Irish landscape of barren rock that stretches for miles.