Match Game: Can You Name These World Leaders?

This week's Nuclear Security Summit was one of the largest gatherings of world leaders hosted by a U.S. president since the 1945 conference that founded the United Nations. But how familiar were the faces of the representatives who traveled to the United States?

We've assembled the photos of 20 people who were there. See how many presidents, ministers and other top leaders you can identify — and then shuffle the deck to add new faces to the mix! - Can You Name These World Leaders?