Welcome to Polycount! For the column normal map, try flipping the green channel. For the building UVs, take a look at modular techniques. http://wiki.polycount.net/CategoryEnvironmentModularity
Can you show us the degree to which you broke down the assets to acommodate modularity. Loving the touch with the glowing eyes at the end of the tunnel.
Not sure if this was posted, but this is AWESOME reference for modular environments. There's a LOT of images and instructions deep in here, be sure to look around (projects page) http://www.hirstarts.com/
Check out Kevin's post about GOW2 bricks. Gears of War 2 modular modeling More here. http://wiki.polycount.com/CategoryEnvironmentDesign#Modular_Design_and_Workflow