Plateau de Beille was Stage 13 of the TDF this year. If you want to get a feel for the stage, particularly the finish, then NASA has put together some satellite data on their site.
They have two satellite photos of the area, but more importantly, they’ve put that together with altitude data to generate a 3D flythrough movie. Worth checking out…
http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16611