Hama, al-Mudiq castle, A side of al-Mudiq castle shows some of its towers

Hama, al-Mudiq castle, A side of al-Mudiq castle shows some of its towers

General view of Jaʿbar castle

General view of Jaʿbar castle

Remains of Islamic Jaʿbar castle

Remains of Islamic Jaʿbar castle

Remains of Islamic Jaʿbar castle

Remains of Islamic Jaʿbar castle

Hama, General view of al-Madiq castle from the southern side

Hama, General view of al-Madiq castle from the southern side

General view of Masyaf Castle

General view of Masyaf Castle

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

Exterior view of Krak des chevaliers (Qalʿat al-Husn)

Exterior view of Krak des chevaliers (Qalʿat al-Husn)

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

Krak des chevaliers (Qalʿat al-Husn), Gothic vaults

Krak des chevaliers (Qalʿat al-Husn), Gothic vaults

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

Excavation works, Dura Europos (Qalʿat as-Salihiyya)

Excavation works, Dura Europos (Qalʿat as-Salihiyya)

Excavation works, Dura Europos (Qalʿat as-Salihiyya)

Excavation works, Dura Europos (Qalʿat as-Salihiyya)

Dura Europos (Qalʿat as-Salihiyya), Roman amphitheater

Dura Europos (Qalʿat as-Salihiyya), Roman amphitheater

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

The northern entrance of the historical city of Dura Europos (Qalʿat as-Salihiyya), end of 4th century BC

Qalʿat al-Mudiq seen from the ruins of Afamiya

Qalʿat al-Mudiq seen from the ruins of Afamiya

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a twin crusader castle, caves

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a twin crusader castle, caves

View on the Euphrates River from the site of Dura Europos (Qalʿat as-Salihiyya)

View on the Euphrates River from the site of Dura Europos (Qalʿat as-Salihiyya)

at-Tabqa, Jaʿbar Castle, Towers of western walls

at-Tabqa, Jaʿbar Castle, Towers of western walls

at-Tabqa, Jaʿbar Castle, Towers of western walls

at-Tabqa, Jaʿbar Castle, Towers of western walls

Jaʿbar castle, southern side of the castle

Jaʿbar castle, southern side of the castle

at-Tabqa, Jaʿbar Castle, polygonal tower.

at-Tabqa, Jaʿbar Castle, polygonal tower.

At-Tabqa, Jaʿbar Castle, Entrance of a bastion with loopholes

At-Tabqa, Jaʿbar Castle, Entrance of a bastion with loopholes

At-Tabqa , Jaʿbar Castle, Bastion with loopholes.

At-Tabqa , Jaʿbar Castle, Bastion with loopholes.

Palmyra, Colonnaded axis and Qalʿat Ibn Mʿan in the back

Palmyra, Colonnaded axis and Qalʿat Ibn Mʿan in the back