The real "father of baseball" rests in Brooklyn.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

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

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Brooklyn's Barkaloo Cemetery is the resting place of a scant two bodies.

On the hills of Bay Ridge stands a house straight out of a fairy tale.

The rare American Civil War-era weapon was never fired in anger.

Once America's longest-manned military fort, now an abandoned hulk.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Red Hook's massive public pool, built by Robert Moses.

A bit of retro transportation flair preserved in the world's largest department store.

Four cars from the old system were once on display, but were removed in 2014.

New York's oldest magic store.

A vibrant, 100-foot-tall mural dedicated to Evelyn Nesbit, the tragic icon of the Gilded Age.

An unconventional space for art and science housed in a massive old warehouse.

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

Cryptic messages embedded in the New York City sidewalk.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

A modern zoetrope on the New York City subway.

Elevated freight railway turned wildly successful urban park.

Red frames showcase remnants of one of New York's original subway stations.

Ride the subways of yesteryear.

Lie in a hammock where George Washington stood.