Carcassonne is a historic fortified city in southern France, and there are several synonyms that can describe it. One synonym is "medieval citadel", which speaks to the city's ancient architecture and strong fortress walls. Another synonym is "walled city", referencing the protective barriers that surround the town. "Fortress town" and "bastide" are also suitable synonyms as they both suggest a sense of strength and security. Finally, "castle town" speaks to the grandeur of the city, as it was once home to numerous nobles and served as a symbol of power throughout the region. Regardless of the synonym used, Carcassonne remains an important cultural and historical destination in France.