This was one of the first (and last) university-built and operated nuclear reactors.

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

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Set sail on a small scale.

Become a prohibition rebel.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The greatest real estate coup of all time.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The most confusing clock in New York.

Nope, not Washington Irving's house.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

There must be a pun in this haystack somewhere...

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

An artist's cute bronze subway sculptures belie his violent artistic past.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Once the home of a hermetic monk, this cave now houses a small church.

Where the lovelorn find a home for their sentimental keepsakes.

A tiny church on a man-made island in the Adriatic.

An ancient knight and a symbol of the city's freedom.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Gargoyle head that brings good luck.