Qasr al-Hallabat is one of the Umayyad complexes collectively known as the
desert castles, with Hammam al-Sarah once functioning as its bathhouse. Hammam al-Sarah's design shows similarities to that of
Qusayr 'Amra, another one of the desert castles. The walls, built of finely dressed stone masonry, carried a decoration of carved mouldings. Only scarce remains of
stucco were found during excavations, and seem to have been used only as frames for doors and windows. The windows were probably glazed, as suggested by fragments of flat, coloured glass, and helped control the temperature. The mosque attached to the northernmost corner of the service rooms (i.e. the furnace) was added at a later date. When exactly was still being debated (as of 2016), as there is no material evidence go by, but it's undoubtedly post-Umayyad. Some describe it as "recent" and "roofless". File:Qasr As Sarah, central vault.jpg|The caldarium, before the reconstruction of the dome File:Qasr As-Sarah, side view.jpg|The eastern side of the building during reconstruction works File:Gazelle Mosaic (36262923730).jpg|Gazelle mosaic in the Hammam ==Research, excavation and preservation==