The World Map is a full screen window which can be accessed by pressing the "M" key. It allows you to view the entire map for the continent you are currently in (Tyria, Cantha, Elona or the Battle Isles). Any explorable areas you have explored and missions, outposts, towns and arenas you have visited will also be shown. By double-clicking any map icon you can instantly travel to that location. You can zoom in and out by clicking.
Note: If for any reason you want to take a screen shot of the entire map, pressing the "Shift" key at the same time as the "PrtScn" key will hide icons in the screenshot.