A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A Manhattan Episcopal church with an eerie underground crypt.

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

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

The loneliest island in New York.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

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

Home of Philip Johnson, one of the 20th century's most influential architects.

A mysterious drive-in nestled in the forest that leaves little to the imagination.

Crumbling hotel echoes with the sounds of the '30s.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.