Located from 43rd to 53rd Streets east of Lexington Avenue, Turtle Bay houses the United Nations, secret waterfalls, and ornate mansions.
https://iyftc1oqf704bytwz45ub151.wpengine.netdna-cdn.com/wp-content/uploads/2013/09/Turtle-Bay-Gardens-Historic-District-Photo.jpg
The 10 smallest historic districts in NYC, from Sniffen Court in Manhattan, Eberhard Faber Pencil Company in Greenpoint Brooklyn to Bertine Block in the Bronx.