Legion Down Under Something I've been trying to remember the name of for a while. Old map from early nineties, runs on E2M1. You start outside a bunker and then descend underground down some curved staircases. It's very, but not completely, symmetrical. Could do without the grid of perpetual lifts. A few bugs e.g. the plasma gun secret can be broken and you can get stuck in it. Not bad for something so old though.
mueller03.wad Another one I've been trying to remember for a while. Mixed theme, tech/factory with hellish bits, feels like it could have been in Mememto Mori or Requiem or some such. Quite "technical", uses some uncommon mapping techniques. Not exactly easy, but pretty good!