I’ve been admiring Jason Thompson‘s beautiful D&D maps that he drew for various classic roleplaying adventures. His sendup of A1: Slave Pits of the Undercity shows a redrawn version of the main dungeon map of the adventure, with each room illustrated to reflect the monsters, traps, and treasure contained therein. Plus, Jason includes annotations describing a theoretical adventure party’s travels through the tunnels.
There are some snarky asides in the annotations. For instance, in The Lost Caverns of Tsojcanth, one note points out that there is a stream running through the top level of the dungeon, so why is the lower level–presumably below the water table–bone dry?
My favorite detail is a lack of detail: X1: Isle of Dread‘s main island map can be downloaded completely blank, meaning that you can customize it yourself. However, my favorite map has to be I6: Ravenloft, which is basically the ultimate haunted castle complete with intricate details throughout.