A DIY art gallery/music venue/lecture hall dedicated to video game culture.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Walk over a 150 year old manhole.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

A library and museum dedicated to typography.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

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

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