I visited Margaret Geller in 1989 at the Harvard Smithsonian Astrophysical Observatory in Cambridge Mass where she took me on a trip with a Cray Super-Computer out to the Great Wall At The End of Space and back again. At the time she was working with Alan Guth at MIT and also enlisting graduate students to map the visible and invisible distribution of dark matter in the universe, the halo of our own galaxy, the Milky Way, and to understand the link between the history of our galaxy and the history of the universe. In 1989 with John Huchra she discovered the Great Wall at the visible limits of the universe based on redshift survey data from the CFA Redshift Survey. She even showed me a configuration of stars at the Great Wall that resembled a cross but cautioned me not to make too much out of it. In 2008 Geller was awarded the Magellanic Premium by the American Philosophical Society for her research into the groupings of galaxies.