This is my entry for the Terranut's contest, but can't post it cause the server is too busy all the time.
The bridge was a pain in the ass to place. I'll guess you can understand that. I used 256 for the atmosphere samples which was no fun at all. I have never used more then 64 samples as I can remember, but then again I usually don't make scenes like this. The most annoying part is that there is still some grain in the distant mountains.
Don't know what else to tell. I just hope you like it.
Special thanks to:
Tim - For the bridge model (downloaded from Terranuts)
Whoever uploaded the Yosemite terrain on Ashundar