This semi-secret storybook hedge maze is also the oldest garden in the city.

Cryptic messages embedded in the New York City sidewalk.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Sniff the Titan Arum's rotting flesh.

The "Seinfeld" diner.

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

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.