I've never seen a photo or visualization that gives a feel for the size of the area at the summit of Everest. There are thousands of photos taken at summit of course, but it's always someone standing on the summit himself, so you don't know how much space is behind the photographer.

According to this source http://www.alanarnette.com/everest/everestsouthroutes.php the summit is 30 square feet (or 3 square meters). I'd still love to see an close-up aerial photo from a helicopter or plane directly overhead.