A Manhattan Episcopal church with an eerie underground crypt.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A notorious punk house turned co-op.

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

A hands-on traveling collection of the innovative devices of yesteryear.

Commemorating the spot where the famous scientist fed his pigeons.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

An artist's cute bronze subway sculptures belie his violent artistic past.

Three-story slide through the New Museum.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Plot your trip through the city on the sidewalk.

A very classy 1920s-era bar right in Grand Central Station.

An accidentally hidden library containing the ephemeral history of New York.

A living archive of urban activism and space reclaimed.

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

Walk over a 150 year old manhole.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

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

From scholastic to sepulchral - now under reconstruction.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A legendary speakeasy bookstore returns from the brink.

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

A celebration of capitalism in Midtown.