🇸🇦 Saudi Arabia · Hydraulic works
Sadd al-Khanaq Dam – Hijaz (Khaibar Oasis northern dam)
Late Pre-Islamic to Early Islamic · Nabataean–Himyarite to Umayyad
110-m two-phase dam (320 BCE–750 CE) on Wadi al-Khanaq — Khaibar oasis northern reservoir.
🇯🇴 Jordan · Archaeological wonder
Qasr Amra
Umayyad Caliphate (c.711–715 CE) · Umayyad Arab / Byzantine influence
Umayyad desert castle bathhouse (qasr) built by Caliph Walid I (705–715 CE) famous for extensive frescoes: vaulted audience hall with hunting scenes, musicians, six kings (Byzantine, Sasanian,…