How do we find our way through the world, geographically speaking? Do we all carry around a type of "mental map" in our head, formed through experience and repetition? Some would say yes, some would beg to differ. Maps remain a powerful way to represent the world in all its spatial glory, and this online exhibit from The Field Museum explores the history of maps and their history over the millennia. Designed to complement an ongoing exhibition at the Museum, the site includes a photo gallery, information about the participating institutions, and about researchers at the Museum who use maps and mapping technology in their own work. The interactive feature is definitely worth a look, as visitors can examine two dozen different maps in detail from Chicago to the Marshall Islands. One can imagine that this remarkable site could also be used in classrooms to expose students to the wide variety of maps that have been created by human hands.