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

Towering basalt columns, a creation of fire and ice.

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

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

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

The ghostly remains of an accidental sea.

A hand-built folk art installation covered with messages of God's love.

A trash dump made beautiful by nature's power.

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

A one-of-a-kind collection of a unique medium.

This shop specializes in oddities and Victorian-inspired wonders.

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

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A psychedelic labyrinth on the San Francisco bay.

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

A huge musical instrument played by the ocean.

This beloved marketplace mascot poops money and grants good luck.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

This elaborate towering structure was once famed for its revolutionary height.