There are Memory Worlds all over the place. Some of them are on big, open worlds full of light and wind. Others are on tiny little airless moons or asteroids. Some represent a full backup of everything and everybody ever saved by the cybers. Others are smaller and more focused to single subjects. Some are kept religiously up to date with the nearest inhabited world. Others are kept secret and dark, and their data can be years out of date. Some have lush and open planetary landscapes to walk on and enjoy. Others sport only virtual worlds, though you can do just about anything you want in a place like that. Be anybody you want to be. There are more kinds of Memory Worlds than I can name. I like them all in their different ways.