A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

An accidentally hidden library containing the ephemeral history of New York.

Three-story slide through the New Museum.

Reverend Jen's unique museum/living room showcases her troll collection.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

Neoclassical bank designed by NY architects Helmle & Huberty.

No monkeying around, this fountain was really named after the classic sci-fi film.

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

A small piece of the composer's New York home lives on in the center of Czech culture in Manhattan.

Where one of Greenpoint's "five black arts" was practiced.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

The place where Dvořák composed some of his most famous works.

An unassuming stone building houses New York City's oldest seismic station almost 30 feet below the Bronx.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

The home of one of America's most beloved fictional characters has become a real world landmark.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

A controversial magical figure is hidden within a diorama of the city.

Church featuring "high Victorian gothic" architecture.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.