I have always loved maps. As a kid, I could spend hours looking through an Atlas. And, even better, my dad had this huge book in his office that had a collection of US maps by county, showing all kinds of crazy demographic and economic information. I loved that book. Since then, I have never found it on sale any where, but this map is a good example of the kind of thing it used to include. Via strange maps, it is a map of leading religions by county. The map also has a clever way of showing where the plurality is a majority.