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

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

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

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.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The famous author's cottage hideaway.

Cryptic messages embedded in the New York City sidewalk.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

A bit of retro transportation flair preserved in the world's largest department store.

New York's oldest and possibly grandest keeper of books.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Reverend Jen's unique museum/living room showcases her troll collection.

Bowl in splendor, if you're lucky.

Sniff the Titan Arum's rotting flesh.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The loneliest island in New York.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The "Seinfeld" diner.