Carcassonne is worth a visit.
Bears repeating. If you’re going that way from Italy, via the Midi…
Some stuff to look at –
Drive through the Cevennes, through the national park area north along the D908 as you head over from Italy via Montpellier (stopping off at Lac du Salagou).
Abbaye de Valmagne make really nice wine.
Aigues-Mortes is a nice walled city the far side of Montpellier in the Carmargues region.
Nimes has a colusseum. Pont du Gard is just up the road. At that point I run out of Midi region knowledge.
Loads of circular fortified villages in that Midi.
In laws used (sadly) to have a small place that way, bought for about 5p in the early 90s, which they then did up, sold, and had to pay the France property tax and basically made nothing on it.