Smaller "quṣūr" are found in modern Jordan, and include Qasr Al-Hallabat (located east of Amman), Qasr Bushir ( north of Lajjun), the castle of Daganiya ( north of Ma'an) and Odruh ( east of Wadi Musa). After the Limes Arabicus was abandoned by the Roman Empire, many of the castra continued to be in use. This continuity was subject to archaeological investigations in the fort of Qasr al-Hallabat, which at different times served as a Roman castrum, Christian cenobitic monastery, and finally as an Umayyad Qasr. Qasr Al-Kharanah is one of the earliest known Desert castles, its architectural form clearly demonstrates the influence of Sasanian architecture.