With a bit more work, NeonKnight would have had my vote, but DevinNight offered a finished and well-designed entry that was also clearly a map of a castle. Djekspek and Gamerprinter provided beautiful entries, but I have to call them illustrations rather than maps. I would find either of NK's or DN's entries useful in navigating their chosen castles. I'm probably more likely to use Castle Mol, even in its current state, but I could use the Dwarven Keep if I wanted to. For several of the others, I could use them as handouts, but I'd still need to make my own floorplan.