The coastal city of Ashkelon was a frequent battleground during the Crusades (between the 11th and 15th centuries), changing hands between Muslims and Christians several times. An archaeological dig has revealed a siege ramp an army left behind has performed an unexpected role, saving the city from being swallowed up by the desert sands. The walls ancient Canaanites built to protect one of their most important cities were breached many times over 5,000 years, but always rebuilt until 1270 CE when Sultan Baybars ordered the city destroyed. It's now a significant archaeological site, but Dr Raf...