AP File Photo (AP File Photo)

Larger image

This year's most high-profile attack yet happened at Moscow's busiest airport on January 24th. A suicide bomber blew himself up in the international arrivals hall, causing the deaths of at least 37 and wounding about 180.

PHOTOS: US leads world in celebrations

IN PICTURES: The death of Osama bin Laden

How US spies found bin Laden's hideout