A crumbling hospital from the 1850s on Roosevelt Island.

One of only two commuter aerial tramways in the United States.

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

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

This park contains a number of standing stones meant to heal and inspire.

The first and only carousel with a lineup entirely of insects.

The "Seinfeld" diner.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

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

There must be a pun in this haystack somewhere...

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A layered tribute to the work of mosaicist Isaiah Zagar.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

The return of something once considered a basic part of life.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

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

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.