A well-known ruin is crumbling. According to Roosevelt Island Historical Society president and historian Judith Berdy, part of the north wing of the Smallpox Hospital collapsed about a week ago. She writes, "The rest of the north wing especially the front is in danger of coming down any time... [The Roosevelt Island Operation Corporation] is working with TPL, the Southpoint park developers to find a way to do emergency stabilization of the rest of......