Troglodytes aren't too unique, cave dwellings are already inscribed. I don't see how much more the ones in Tunisia can offer but it does make for a great visit. The area has lots of them and they are not tourist museums but still in used by families today. The description calls them storage and granaries but they appear to be just homes. You can follow signs to visit one, pay the family some money to be shown around and try not to feel like you just intruded their lives, because it sure felt that way on my visit. If you can't find one you can always ask in town. I think I also saw one there that seemed more touristy but I had already visited two by then so I was good to continue on my journey.