Roman columns in the ruins at Busra, Syria.

An ancient Roman market in the ruins at Busra.

An ancient Roman theater at Busra.

The crusader castle of Krak des Chevaliers in Syria.

A view from the towers at Krak des Chevaliers.

The famous Umayyad Mosque in Damascus, Syria.

Another view of the Umayyad Mosque in Damascus.

A view of Damascus' Umayyad Mosque showing ancient ruins of the pagan Temple of Jupiter.