I loved Carcassonne with its massive stone walls, pointy turrets, and the inner castle of Chateau Comtal.  Sure, Viollet-le-Duc may have taken some artistic license, but the overall result is really fantastic.  Part of my enthusiasm for the city may be from the time of year that I visited. I visited in late October -- the weather was crisp and fine, and the crowds very small. I might feel differently if I had been fighting the summer hordes. I had an easy time getting photos with no people during the early morning or evening. I made it my base for a few nights, staying a couple blocks outside La Cite'. I had a blast exploring many Cathar Castles (and non-Cathar) in the extended area,  from the 4 castles of Las Tours down to the Pyrennes, plus other sights, including the WHS Canal du Midi. One of Carcasssonne's highlights was certainly taking the ramparts walk (combined ticket with the Chateau Comtal). I also stopped in for mass in the ancient basilica in the citadel.  This has some gorgeous stained glass, which was unfortunately mostly hidden behind scaffolding while I was there (2017), but I really loved the small glimpses I could get. It was great strolling into the citadel after dark for a hot dish of cassoulet at one of the outdoor restaurant tables in the chilly autumn air.