A view of Qalʿat Shayzar along the Orontes river

A view of Qalʿat Shayzar along the Orontes river

at-Tabqa, Jaʿbar Castle, polygonal tower.

at-Tabqa, Jaʿbar Castle, polygonal tower.

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, 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.

At-Tabqa, Jaʿbar Castle , one of the Castle's towers.

At-Tabqa, Jaʿbar Castle , one of the Castle’s towers.

At-Tabqa , Minaret of the Mosque at Jaʿbar Castle.

At-Tabqa , Minaret of the Mosque at Jaʿbar Castle.

A side from archaeological city of Dura Europos (Qalʿat as-Salihiyya)

A side from archaeological city of Dura Europos (Qalʿat as-Salihiyya)

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 gate of south-western side, Dura Europos (Qalʿat as-Salihiyya)

The gate of south-western side, Dura Europos (Qalʿat as-Salihiyya)

Palmyra, Colonnaded axis and Qalʿat Ibn Mʿan in the back

Palmyra, Colonnaded axis and Qalʿat Ibn Mʿan in the back

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

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

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

Euphrates valley south of Qalʿat Najm as it looked before the flooding of lake Tishrin

Euphrates valley south of Qalʿat Najm as it looked before the flooding of lake Tishrin

Jurn Kabir, a typical old house of the Euphrates valley near Qalʿat Najm with a large log (willow) transverse to the longitudinal axis.

Jurn Kabir, a typical old house of the Euphrates valley near Qalʿat Najm with a large log (willow) transverse to the longitudinal axis.

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

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

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

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

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a twin crusader castle, general view of the site

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a twin crusader castle, general view of the site

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, twin crusader castles, stone arch

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, twin crusader castles, stone arch

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a general view of bridge between the two castles

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, a general view of bridge between the two castles

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, the trail around the two castles

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, the trail around the two castles

Jisr ash-Shughur, the ruins of Qalʿat ash-Shugr wa-Bakas, a twin crusader castle

Jisr ash-Shughur, the ruins of Qalʿat ash-Shugr wa-Bakas, a twin crusader castle

Jisr ash-Shughur, the ruins of Qalʿat ash-Shugr wa-Bakas, a twin crusader castle

Jisr ash-Shughur, the ruins of Qalʿat ash-Shugr wa-Bakas, a twin crusader castle

Qalʿat ash-Shugr wa-Bakas, the connection bridge between the two castles

Qalʿat ash-Shugr wa-Bakas, the connection bridge between the two castles

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, the ruin of the twin crusader castle

Jisr ash-Shughur, Qalʿat ash-Shugr wa-Bakas, the ruin of the twin crusader castle

Tartus, Qalʿat al-Marqab, Crusader castle, a courtyard in the castle.

Tartus, Qalʿat al-Marqab, Crusader castle, a courtyard in the 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