When I was running the Wilderlands a while back I decided an easy way to get interesting maps would be to convert maps from the Doom, Doom 2, and Final Doom so that they could be easily represented on twiddla. Since I was copying them from various wikis I wasn't necessarily sure where the entrances and secret doors were 100% of the time.
Anyway, since I can't do anything else with them I decided to start posting them on her after I work them up in gridmapper.
Note to my players: it is highly likely that I will still use these maps at some point in the foreseeable future, so you might not want to look too hard at them.