One World Observatory, at 1 World Trade Center, has an opening date: Friday, May 29. And the $32 tickets—all are for timed entry—go on sale tomorrow at 10 a.m. (I realized I had no idea which floors it’s on, and I still don’t. The website says the elevators take you to the 102nd floor, but then it also says that the main observatory is on “the 100th floor of the Observatory, also known as the Discovery Level.” So it’s on 100, 101, and 102? I could Google it, I suppose, but I’ve run out of steam.)