Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A world-class collection of mechanical musical instruments and automata.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Queen Anne style apartment house built in 1886.

Neoclassical bank designed by NY architects Helmle & Huberty.

Ornate "Renaissance Revival" style building.

A way to take your secrets to someone else's grave.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

An 1883 schoolhouse now home to collective of artists.

Micro-distillery in Brooklyn produces New York’s first homemade rum since Prohibition.

A decommissioned military complex that's now a modern industrial park.

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

“Invented in Key West, Perfected in Brooklyn."

A charming "tea atelier" hidden away in Greenpoint, Brooklyn.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

Commemorating the spot where the famous scientist fed his pigeons.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A modern mechanical planetary system, part of a 10,000 year clock.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The most decorated dog of World War I is preserved in the Smithsonian.