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

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A huge musical instrument played by the ocean.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

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

An overlooked and unassuming engineering marvel.

A monument to the love people have for their pets.

An essential stop before plundering, BYO Cutlass.

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

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

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

A Barbary Coast watering hole built into a Gold Rush shipwreck.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

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

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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

There's nothing creepier than a cemetery next to a clown motel.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

This Southern Californian Conservation Center is home to singing and howling apes.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

A stellar example of Art & Crafts architecture, and a movie set to boot.