The title pretty much says it all. One of the things I want the most for civ5, is the implementation of an actual 3d map. Now, the map is in 2d, without a z axis. Adding the 3rd dimension can greatly alter the game as the map of the game is the 1st layer of gameplay. Everything else builds on top of it. Altitude adds a lot of new strategic elements such as: Altitude dependent resources/terrain, relative position defensive bonuses (units higher than others gain an advantage), on the fly calculated movement penalties, realistic and varied map geography, new types of terrain such as cliffs, environmental elements affecting cities/improvements (micro-climates: two tiles of the same type, yield different bonuses as the climate between them is different), geological bonuses in researching a particular technology (coastal civs get a bonus towards Sailing/Fishing and so on) etc etc. So what do you think?