I actually might do this: Make your own coasters- 4x4 tiles & 4x4 scrapbook paper. Adhere to tile with Mod Podge and let dry. Spray a coat of clear spray paint and let dry. Then attach felt pads to the bottom. LOVE IT!!
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.