The area of the map where there are two railroad tracks side by side leading nowhere. There is a very cool pile of wooden rubble lying between. The right rails of both tracks are Z-fights.
BTW- this map has a very cool theme idea, and I'de like to see more maps like it. The map has a lot of potential but it could use some improvements.
First of all, it seems like it has lots of potential secret areas which would be very cool, but u cant actually get to any of them; like the dark murky pit blocked off by planks and the high atrium-ish area over the center room. There are others too. Secret areas are awesome and they give the player something to look for.
Secondly (this one relates more to actual game play): the map is themed so similarly throughout, that you forget where you are. I can't speak for everybody, but I like maps that I can learn. Think of landmarks- maybe areas that look significantly different (and not just by color). Another idea(and I mention this one cause you actually almost did it): have and outside area thats borders one entire side of the map with many windows (or doors, depending on whether or not it will be reachable) to it. Then, suddenly, the map would feel like a wooden base with a front and a back, and I would be able to keep my orientation much better. Your outdoor area looked cool, but it was only visable through one tiny window. It almost seems like you could have not more out of the effort.