The historic centre of Avignon, comprises the Cité des Papes and the bridge but also the Cathedral Notre Dame des Doms, the Jardin des Doms, the Petit Palais museum and the wall surrounding the historic centre of the town. They're all of interests but obviously, the pope's castle is the main thing to visit and offers a great testimony of the medieval french life. Give a look at the beautiful paintings on the ceiling of several rooms and enjoy walking on the Avignon old bridge that offers a great view of the Popes' castle.