I visited many caravanserai in Iran. Some of them are new, basically pit stops for gas, food and repair your car, they often call them service station now though as you may expect. Some of the classic caravanserai are now guest houses or coffee shops. The classic ones are supposed to be for when the silk road camel “caravans” were passing through Persia and needed a place to rest and refresh. If you look on the map you can make out a line going west <> east. There are some caravanserai not included in this inscription request, most notably the one next to Cyrus' tomb, but an easy “tick” would be to see the one in Bisotun which is a one of those coffee houses now. I spent some time finding the ruined ones along the road but sometimes they are not easy to find, perhaps the road doesn't allow you to venture into the area next to the highway, it would be silly to go off-road with a sedan, but sometimes the ruins are just there in plain sight, unprotected unfortunately.

Taking Khaneh Khowrdeh as an example (romanization may vary) one can just take a road off the highway and you park right in front of it. There is no tourist sign, only a sign for what I believe is deterring vandalism. Graffiti is rife in and outside the walls. Gone are the camels and the new visitors, baaaaaaaaa, leave so much poo that it's not easy to venture inside. This caravanserai still holds up pretty well though. You can see all the separate rooms prepares for guests with a large courtyard as central point. I think this was still the best one that is not in total ruins and not modernized as a guest house.

These buildings need better protection, at least a fence around it.