The Palais des Papes (Palace of the Popes) is one of the largest and most important medieval Gothic buildings in Europe.  Once a fortress and palace, the papal residence was a seat of Western Christianity during the 14th century; six papal conclaves were held in the Palais, and since 1995, the Palais has been classified, along with the historic center of Avignon, as a UNESCO World Heritage Site.  The unmailed card has some ink transfer most notable along the lower left edge, and is heavily aged but otherwise clean.  Grade: 3