"Full victory—nothing else," echoed Dwight D. Eisenhower in 1944, but what really makes a good leader? On Presidents' Day 2013, TIME.com recognizes the service, sacrifice and success of former US heads of state by giving readers a brief history lesson illustrated by colorized versions of iconic presidential portraits.
The Commons is an archiving project by photo sharing website Flickr which aims to increase public access to photography collections without known copyright restrictions. Since its launch in 2008, it has become a treasure trove of countless rare images provided by institutions like NASA, The Library of Congress, and more. Here are some of its most popular discoveries.