This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The "Seinfeld" diner.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

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

There are owls with glowing eyes in Herald Square.

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

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

A bit of retro transportation flair preserved in the world's largest department store.

The most confusing clock in New York.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Unrepaired walls from a 1920 anarchist bomb attack.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Avoid gangster interaction while window-shopping.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Cryptic messages embedded in the New York City sidewalk.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Order scoops of pandan, lychee, and black sesame at this family-run institution.