Palais des papes of Sorgues
Sorgues, France
The Palais des papes of Sorgues is the first papal residence built by the Avignon Papacy in the fourteenth century. Its construction was ordered by John XXII and preceded by 18 years the Palais des papes. This luxurious residence had served as a model for the construction of residences of cardinals in Avignon. It remains today as ruins, because the palace was dismantled during the French Revolution by the builders that the town of Sorgues had sold.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).