An incredibly picturesque city with much to see, making for a very rewarding day trip indeed.
A must when in Provence.
Dating back to Roman times and the seat of the Roman Catholic papacy for more than century, Avignon is a day or overnight trip you should try to make time for when visiting Marseille, just 90 minutes away by bus. The first thing that will most impress you about the city is the majesty of structures such as Notre Dame d'Avignon and the Gothic Palais des Papes, 14th-century seat of the popes during the so-called "Babylonian Captivity," site of much intrigue among the curia, and more recently declared by UNESCO a World Heritage Site. From this palace you can visit the medieval Saint Bénezet Bridge on the Rhône River, which besides a chapel and museum represents a charming symbol of the city. To see the papal complex from the other side of the river you can catch a free ferry which crosses every 20 minutes.