The Caliph: A New 3-part Series about Islam

Teaching Islam? Empire of Faith is a good documentary from PBS that has been the standard for years.

But a new three-part series from Al Jazzera called The Caliph may offer a new standard. And you can stream it for free. 

Part one deals with the Islam's founding. Part two outlines the division between Sunni and Shia, and part three reviews the decline of the Ottoman Empire and the last caliphate.