It's been in business for more than 120 years, and it helped launched the careers of Edwin Hubble, Carl Sagan, and a handful of Nobel Prize winners. But its time is now coming to an end. Yerkes Observatory, a beautiful monument to astronomy on the shores of a lake in Williams Bay, Wisconsin, will soon close its doors and cease operations. In this week's article, I offer a few words of retrospective about one of the crown jewels of modern astronomy and one of my favorite places in the world to visit...