Photo via Wiki Commons
Between the United Nations building and Long Island City sits a tiny 100-by-200 foot piece of land, known as U Thant Island. The East River man-made enclave is just south of Roosevelt Island and legally part of Manhattan. As Atlas Obscura discovered, the land did not exist until the 1800s when a trolley tunnel was dug beneath the River to connect Manhattan and Queens. While U Thant looks like a nice place to get some sun and relax, the island remains closed to the public as a bird sanctuary.