The Minas Tirith Project
 

In case you haven't heard of it yet, check out THIS video on YouTube about it.
The project consists of creating a full scale 3D map of Minas Tirith that looks just like in the movie. In the video description you can also find a link to their homepage where the viewer is free to download. Only problem is because of the huge size of MT you need a good graphic card and enough RAM. But if you can it's worth it.

I remember on the Online Shooter 'Wolfenstein; Enemy Territory' there used to be map very similar to the minas tirith project. Actually... untill about 1:50 in the vid I can't find any notable differences..... here's a video about that level....... ^_^