U Thant, a tiny man-made island you're not supposed to visit

U Thant, or Belmont, is a tiny artificial island in the East river made from the detritus drilled out for the 7 train's tunnel. Leased to a religious sect since the 1970s, it was designated a bird sanctuary in the 2000s after a protestor occupied it and declared it a micronation. Since then, no humans, please. [via Metafilter; Photo: Pacific Coast Highway]