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Sami, 32, steps into an underground Roman tomb used for shelter from Syrian government forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday, Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

In this photo taken Tuesday, Feb. 26, 2013, damage caused by shelling at a 17th-century caravanserai, which presently serves as a headquarters for the Free Syrian Army, in Maaret al-Numan, Idlib province, Syria. Across northern Syria, rebels, soldiers and civilians are making use of the country's wealth of ancient and medieval remains for protection. The structures are built of thick stone that has already withstood the ravages of centuries. They are often located in strategic spots overlooking towns and roads. (AP Photo/Hussein Malla)

A Syrian woman, leaves an underground shelter that her husband made using a jackhammer from shelter from Syrian government forces shelling and airstrikes, at Jirjanaz village, in Idlib province, Syria, Thursda,y Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

Nadia, 53, makes bread on a wooden stove, at an underground Roman tomb which she uses as a shelter with her family from Syrian governemnt forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday, Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

In this photo taken Tuesday, Feb. 26, 2013, fuel barrels are stored in front of Roman and Byzantine mosaics inside the 17th-century caravanserai, which presently serves as a headquarters for the Free Syrian Army, in Maaret al-Numan, Idlib province, Syria. Across northern Syria, rebels, soldiers and civilians are making use of the country's wealth of ancient and medieval remains for protection. The structures are built of thick stone that has already withstood the ravages of centuries. They are often located in strategic spots overlooking towns and roads. (AP Photo/Hussein Malla)

In this photo taken Tuesday, Feb. 26, 2013, ancient mosaics which were damaged by shelling are seen inside a 17th-century caravanserai, which presently serves as a headquarters for the Free Syrian Army, in Maaret al-Numan, Idlib province, Syria. Across northern Syria, rebels, soldiers and civilians are making use of the country's wealth of ancient and medieval remains for protection. The structures are built of thick stone that has already withstood the ravages of centuries. They are often located in strategic spots overlooking towns and roads. (AP Photo/Hussein Malla)

Sobhi al-Hamod, 60, stands inside an underground shelter he made using a jackhammer to protect his family from Syrian government forces shelling and airstrikes, at Jirjanaz village, in Idlib province, Syria, Thursday, Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

A Free Syrian Army fighter, Abu Mohammed, speaks inside a cave used for shelter from Syrian governemnt forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

Nihal, 9, puts olive tree branches inside a wooden stove at an underground Roman tomb which they use shelter from Syrian government forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

A Syrian girl, leaves a cave used as shelter from Syrian government forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday, Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

In this photo taken Tuesday, Feb. 26, 2013, ammunition vests are seen in front of a mosaic inside a 17th-century caravanserai, which presently serves as a headquarters for the Free Syrian Army, in Maaret al-Numan, Idlib province, Syria. Across northern Syria, rebels, soldiers and civilians are making use of the country's wealth of ancient and medieval remains for protection. The structures are built of thick stone that has already withstood the ravages of centuries. They are often located in strategic spots overlooking towns and roads. (AP Photo/Hussein Malla)

Sami, 32, center, speaks with his children at an underground Roman tomb which he uses with his family as shelter from Syrian government forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

A defected Syrian policeman, Adnan al-Hamod, 33, lights a kerosene lamp at an underground cave used for shelter from Syrian governemnt forces shelling and airstrikes, at Jirjanaz village, in Idlib province, Syria, Thursday Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

Syrian children, walk out of an underground tunnel that their father made with a jackhammer for shelter from Syrian government forces shelling and airstrikes, at Jirjanaz village, in Idlib province, Syria, Thursday, Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)

Nihal, 9, looks at the entrance of an underground Roman tomb used as shelter from Syrian government forces shelling and airstrikes, at Jabal al-Zaweya, in Idlib province, Syria, Thursday Feb. 28, 2013. Across northern Syria, rebels, soldiers, and civilians are making use of the country's wealth of ancient and medieval antiquities to protect themselves from Syria's two-year-old war. They are built of thick stone that has already withstood centuries, and are often located in strategic locations overlooking towns and roads. (AP Photo/Hussein Malla)