Subway passengers affected by the sarin gas attack on Tokyo's subway system are carried into St. Luke's International Hospital in Tokyo on March 20, 1995. Thirteen people were killed and more than 6,000 injured in the attack, which was carried out by the Aum Shinrikyo cult. Chikumo Chiaki/AP hide caption

itoggle caption Chikumo Chiaki/AP

Then-Iraqi dictator Saddam Hussein (at right) behind an artillery piece during the Iraq-Iran war. (An undated photo from the 1980s.) Reuters/Landov hide caption

itoggle caption Reuters/Landov

Iraqis walk past a wall that a car bomb destroyed, next to the Ahl al-Bayya' mosque in southeastern Baghdad Monday. At least 10 bombings were reported in the city today. Ali Al-Saadi /AFP/Getty Images hide caption

itoggle caption Ali Al-Saadi /AFP/Getty Images

Iraqi anti-government gunmen from Sunni tribes in western Anbar province march during a protest in Ramadi, west of Baghdad, Friday. Azhar Shallal/AFP/Getty Images hide caption

itoggle caption Azhar Shallal/AFP/Getty Images

Ten years and $60 billion in taxpayer funds later, Iraq is still so unstable and broken that even its leaders question whether U.S. efforts to rebuild it were worth the cost. That's the finding of a report to Congress by Stuart Bowen, the Special Inspector General for Iraq Reconstruction. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP