New York City's smallest piece of private property.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

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

A whimsical, but often overlooked clock in Park Avenue.

The most confusing clock in New York.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Ride the subways of yesteryear.

The former hotel where Tesla invented the radio.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

Mansion and shopping center used in the 1975 film "The Stepford Wives."

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Church featuring "high Victorian gothic" architecture.

Elevated freight railway turned wildly successful urban park.

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Neoclassical bank designed by NY architects Helmle & Huberty.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

A curious friendship between two inanimate ladies.