The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A living archive of urban activism and space reclaimed.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A celebration of capitalism in Midtown.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

An abandoned castle owned and ignored by Masons carries a cursed history.

Become a prohibition rebel.

New York City's smallest piece of private property.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A dilapidated dock tells the story of Titanic's missed arrival.

A semi-scholarly approach to sex.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Deadly airliner crash preserved for those willing to climb and pay respects.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

The world's first commercial spaceport is a disappointment of cosmic proportions.