A self-study I did creating various roads using L4D2 Hammer Source Level Editor. All textures and modeles are from L4D2 game. No custom textures or models.
The environment doesn't contain any gameplay entities other than a player start. I also did a 8-part tutorial series documenting the process and everything I've learned.
Here is the reference image of Raye Street House and final in-game screenshot.
I also did 2 videos using this environment. First one was a fly-through showcasing the environment and second was a fun Left2Party trance music video. I had a lot of fun creating the music video.