Cover a wall large enough for the task with corkboard and place on this maps of every country you have lived in or visited. In these place a pin or other marker in every town you have been to. Depending on space and detail you want, you could use regional maps for some, or all, countries. If you have less space, you could try this with a world map and mark each country and major city.
You could form a joint-self-portrait with others by placing different colour markers for each person.
