The Guardian UK just did a piece on the historic Qasr Prison with many photos. It mentions how the site now turned in to a museum now has former prisoners working at guides taking visitors through different part of the now refurbished building.
There are also recreation parts to the structure as well as a traditional tea house, Guardian goes on to say that visitors “learn about the fates of prisoners whose tales of abuse, though varied in their historical contexts, are not so different from those suffered by contemporary detainees in the Islamic republic.” The site was reconstructed as a prison in the early years of Reza Shah’s administration. See the full report via this link.