Walk over a 150 year old manhole.

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

Join in a Seance at the Swedenborgian Church.

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

Prove you deserve to be fed by Kenny Shopsin.

A hidden "place of interment for gentlemen."

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

Once a popular watering hole among longshoremen and shipyard workers, this neighborhood treasure spans more than 100 years of Red Hook history.

Risk arrest while partying to fund art.

A big shiny gin and whiskey distillery in Sunset Park.

Abandoned power station once home to a squatter community, now being developed into an arts center.

This one-man homegrown eatery may be the world's most exclusive restaurant with its five-year waiting list.

The oldest living organism in New York City. Maybe.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.