There's no interesting history for today's map. It's simply the result of a five-minute doodle I made the other day. (Isn't it amazing how technology can be used to clean up a hasty sketch?) What I like about this map is that it is easy to navigate between the three exits. To get just about anywhere else requires detecting one or more secret doors, yielding plenty of places to hide things…
In one area there is a 20-foot square obsidian cube surrounded by twenty skeletons. I am sure that they will animate and menace the player characters in Ray Harryhausen fashion. How and when, of course, is up to you. Do they animate on the approach? Perhaps, when a daft character touches the cube? I really have no idea—you figure it out.
In another area is a pool of blood. It's on the ceiling, not the floor. The player characters will probably notice it by the periodic dripping of blood. The statue in the room is looking up and has its hands thrust into the crimson pool. What's the deal with this pool? More importantly, what is living in it?
So many questions, O creative DM.
The Fine Print: I am sharing this map under a Creative Commons Attribution-Noncommercial-Share Alike license. If you follow that link you will be able to read about the conditions that apply to this work. In a nutshell: (a) you can't use it commercially, (b) you must attribute it to me, and (c) you must share any derivative works that you create.