The attack on Iran's three main nuclear sites was the largest operational strike ever by B-2 stealth bombers, and the second-longest B-2 operation ever flown, surpassed only by those following the September 11, 2001, attacks on the United States by al Qaeda.

Iran was found in non-compliance with its NPT safeguards obligations in an unusual non-consensus decision because it "failed in a number of instances over an extended period of time" to report aspects of its enrichment program.

Iran has more than thirty nuclear facilities spread out across the country, with several built deep underground. Here's a look at those that have been or could be targeted in the U.S. and Israeli operations, the damage some have sustained so far, and the possible consequences of striking nuclear facilities.