Qasr el-Al, one of three Nabatean / Roman fortifications within the visual contact between them, is situated just 4km north of Qasr Bshir and like Qasr Abu el-Kharaq, was reused by the Roman army to secure the eastern desert border of Arabia province.
Excavation of the site suggested it was occupied from Iron Age all through till our present time. A Nabatean inscription found at the Qasr points out at the fortress with stone enclosure was built during the Nabataean period. A cistern and water structure of kind were also found at the site.
Romans reinforced the fortress to use it as a watchtower but not much more information is available at the moment.
Qasr el-Al can be visited via Desert highway and a 4×4 or crossover vehicle is required to reach the site.