You're probably well used to seeing Syria in the news these days, but tonight Dan Snow wants to take us behind the scenes, travelling back in time to explore the history of the civil war that splits the country. Dan's finding out more about the historic divisions between Sunnis and Alawites, Islamists and secularists and east and west, that now manifest themselves on the streets of Aleppo and Damascus. He'll be uncovering a land that has long been fought over, with empires and despots vying for control over thousands of years.