Les Baux was one of my favorite towns. It's a hill side town with a large medieval castle on top. There was an audio guide of the castle, so it talked about the history of the castle and the different large weapons used to protect the town. The tour of the castle was one of the more comprehensive ones we went through.
The surrounding areas of the town are protected. In the valley below, there isn't any building allowed, so it's just vineyards, cyprus trees, and olive orchards.
One of the coolest things we saw, though by far the hardest to explain, was the Lumieres. It was a short walk from the center of Les Baux. It was a large limestone cave that has been turned into a culturalspace. They project movies onto the large limestone surfaces. The program we saw was a collage of works by Michelangelo, Leonardo DiVinci, and Rafael. It's really hard to explain, but here is a video from their site that is the closet I could find.
https://vimeo.com/118717269?iframe=true&width=650&height=400