Historic Cairo Ibn Tulun Mosque (870-879), the oldest surviving mosque in Egypt. Its minaret was modelled after the one in Samarra.; link
Masjed-e Jāme' initiated under the reign of al-Motasem the Abbasid (AB ev)
Samarra Its capital from 836-892, several surviving buildings including the spiral minaret
Shibam Great Mosque of Shibam (The presence of red baked bricks, typical of ninth century Abbasid construction, point to reconstruction efforts during the reign of Caliph Harun al-Rashid) - see link; link
Toledo Mosque of Bab Mardum (999), built under authority of the Abbasid Caliph. A small square mosque typical of the period. Later turned into a church (Cristo de la Luz)
Do you know of another WHS we could connect to Abbasid Caliphate?
Send it to me!