Arguably one of the best-made mods, ever. It not only changes Skyrim's setting and story, but the entire gameplay too. The game feels a lot more like a traditional RPG than a TES game. Really impressive work, and some of the locations in this mod are simply breathtaking.

One of the things I did not enjoy, however, is the fact that the new gameplay changes don't always translate smoothly into Skyrim's engine.