Sunni tribesmen train on the outskirts of Ramadi, Iraq, on Nov. 16. Legislation authorizing a force of Sunni fighters drawn from Anbar province itself — modeled on the U.S. National Guard — has yet to be passed. Ali al-Mashhadani/Reuters/Landov hide caption

itoggle caption Ali al-Mashhadani/Reuters/Landov

The Jewel of Muscat, a replica of a ninth century Omani trading ship, sails into the harbor of Galle, Sri Lanka, in 2010. The ship was built in a traditional manner that uses coconut fibers (but no nails) to hold the ship together. The ship followed old routes used by Arab traders. Lakruwan Wanniarachchi/AFP/Getty Images hide caption

itoggle caption Lakruwan Wanniarachchi/AFP/Getty Images

The Islamic Youth Council in Derna, in eastern Libya, is among the local militant groups from Egypt to Libya that have reportedly pledged allegiance to the self-proclaimed Islamic State. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Islamic State fighters march in Raqqa, Syria. The group has killed five Western hostages in recent months. In the 1990s, many radical Islamist groups gave interviews to journalists and refrained from kidnapping Westerners. AP hide caption

itoggle caption AP

The population of the Syrian city of Douma — a rebel enclave — has dropped from 750,000 to about 250,000 since the start of the Syrian conflict. Photographer Saeed al-Batal (a pseudonym) has captured life in this city under siege. Here, a scene from Douma photographed on Oct. 23. Saeed al-Batal hide caption

itoggle caption Saeed al-Batal