Idea shamelessly stolen from Urlphantomhive. The idea is to keep track of the countries/states you visited via books. So far I only read four books, two set in the US and two set in a fantasy-ish world so my maps don't look that impressive:
visited 2 states (4%)
I spare you the visited countries one :P
Stats:
Real Countries visited: 1 (US)
US - States visited: 2 (California & Georgia)
Phantastical countries visited: 2 (Land of the Niflungs, Gothic Italy with curses but really it could be anywhere)