The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

These ornate manhole covers were used for a now-forgotten purpose.

Join in a Seance at the Swedenborgian Church.

There are owls with glowing eyes in Herald Square.

Unique antiquarian shop specializing in globes, maps, and prints.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

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.