CP_SPILLWAY
Here are some sample screenshots from my TF2 map. I created this as a project to teach myself how to use Source and the Hammer editor. I found some very distinct differences between Source and Unreal3, some good, others not so good. Learning the displacement system was probably the greatest challenge, initially it seems far inferior to Unreal's terrain system but once you get used to it it is a lot more flexible as it can also be used for vertical surfaces such as cliffs and tunnels. The 3D Skybox was also quite a task to get working!
Click on the thumbnails to see full resolution versions!