This is a wonderful idea! Even if it wasn't around the world, just on ONE trip, cataloging everywhere you visited like this is a fun and creative way to do it...because looking through pics from old trips can be VERY uninteresting
Lay a world map over 3 canvas, cut into 3 pieces. Coat each canvas with Mod Podge and wrap the maps around them like presents. Let dry and hang on the wall about 2" away from each other. I also like the idea of adding pins to all the places you've been.