I actually never planned to visit this WHS although it consists of so many sites that it is hard to miss on a trip to France. Last July, I saw the Saint-Jacques Tower (fortunately without the scaffolding described by Ian) on my first full day in Paris and I later visited the huge Amiens Cathedral (also a WHS in its own right). Unfortunately, I was not able to visit the Alyscamps cemetery while in Arles due to time constraints, but I have seen photos and it looks quite interesting.