New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

A playground the size of a city block is a modernist monument to civic values and public housing.

Peek through the gates at this oasis from the city, full of Old English charm.

The reconstruction of this prominent building fulfilled a long-written command.

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

Love is in the air along the small street in Brooklyn.

Inspired by the famous sculptures on Easter Island, this head serves as a popular meeting spot by Shibuya Station.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

These century-old townhouses contain some of the first car garages built in the United States.

This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

This unusual subway stop was originally a real estate office.

Sunset Park's Guatemalan community knows to head to the back of this bodega for a taste of home.

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.

A working monastery hidden away in Brooklyn once abutted the location of a former inebriate's home.

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

Historical figures from New York City's Catholic community reside in Midtown.

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.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.