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

Nondescript elevator doors open to reveal a stunning, surreal world.

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

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

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

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

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

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.

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

The "Seinfeld" diner.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

New York City's smallest piece of private property.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.