isis is advancing on the ancient syrian city and leaving a trail of bodies in its wake. a few hours ago we received word militants executed 23 family members of syrian government workers in a village near palmyra, the syrian observatory for human rights says nine of the murdered were children. as isis gets closer to palmyra there are concerns it will bulldoze the unesco world heritage site as the it has done in syria and iraq. palmyra is home to ancient roman ruins, statues, monuments and architecture are thousands of years old. senior international correspondent shows us why palmyra is significant to syria and the rest of the world. >> reporter: palmyra for 2,000 years, columns and temples loomed over the oasis of syria,