This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

Bowl in splendor, if you're lucky.

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

From scholastic to sepulchral - now under reconstruction.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

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

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

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

A hip bar decorated with walls of golden skulls.

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

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

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

A Belle Epoque bordello turned into a themed love hotel.

Inside a former cabaret, seven floors of erotic art.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

One of the oldest medical collections in Europe focusing on rare surgical instruments.