After three years of violence, pilgrims return to Karbala's shrine.
The US military will begin handing over thousands of Iraqis who were captured during the war to Iraqi authorities on Sunday.
The $592 million, 104-acre compound that was dedicated in Baghdad's fortified Green Zone on Monday is meant to symbolize a long-term commitment to Iraq.
As US forces pull back, Iran is expected to widen its influence in Iraq, despite the two countries' history of war and mistrust.
Control of roads and rural areas vexes coalition effort.