I posted the maps of the Montporte Dungeon after 15 Sessions back in September 2013. Here are the maps of the same dungeon after 25 sessions of play. I have kept the maps simple this time. I placed a purple "U" next to any unexplored door, corridor, room, or area. I placed a red "U" for the two ladders that lead down from Level 2 to an area still unexplored (maybe Level 3?).
Click on the maps to enlarge them. 1 square on the map equals 5 feet.