This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

The most confusing clock in New York.

Here, exhibits come with a side of edible history.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A Jewish deli run by Yemeni Muslims in an Afro-Caribbean neighborhood is quintessential Brooklyn.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

The library of every book lover's dreams.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

The site of a tragic massacre that spawned a multimedia franchise.

This abandoned subway station can still be seen on regular commuter trips.

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

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

More gold than anywhere else, ever.

The "Seinfeld" diner.

Sniff the Titan Arum's rotting flesh.

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

Read a book next to a Midtown waterfall.

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

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