I love maps. I could look at them all day. If I go with you to a bookstore and we wander off and lose each other, you can almost always find me again in the travel section.
Here's where I've conquered in the US (I'm counting a few airport only stops too):
create your own personalized map of the USA.
I've made such a small dent in the rest of the world that I'll do a Europe only map:
create your personalized map of Europe.
Next stops, Costa Rica, China, Chile, Argentina. So many places to go, so little time (and money)!