The last city map, and a pretty fun one. This one is best known for the Cyberdemon vs Spider Mastermind fight right near the beginning, but I actually loop around the map and get a few secrets first so I can be properly stocked up on rockets.
This is a map where you probably won't find most of the secrets on your first playthrough. There's quite a few large optional areas that you'll need to go way out of your way to find with a radsuit and some trips across the sea of lava, but it's worth doing so for the BFG. The BFG will save you during the final few Cacodemon/Pain Elemental ambushes which can get pretty intense.
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