I collect maps, although just prints so far. One of my favorites has been this universe map from National Georaphic.
One of the authors of that map has collaborated to develop a map of the entire universe where essentially all interested features of space, from specific satellites in Earth’s orbit to the edge of the Milky Way and the limit of the visible universe, can be easily viewed on one flat surface. The trick was to to follow the same perspective as Saul Steinberg’s famous “View of the World from 9th Avenue”:
Here is the actual map. On Internet Explorer, push F11 to display it full screen.
And here are a bunch of other formats, in case you want to print it out and frame it, as I plan to do.