For a while capital of Christendom in the  Middle Ages, Avignon has preserved an exceptional cultural inheritance from its History, and a large part of this is listed by UNESCO as World Heritage sites : 

not only the Palais des Papes and the Pont d’Avignon but also the  large square in front of the Palais with the baroque façade of the Exchange, the Museum of the Petit Palais and the Avignon Cathedral, Notre-Dame des Doms, as well as the stretch of ramparts that run from the Garden of Les Doms to the bridge. .

> More info about UNESCO world's heritage