Maps made by children are interesting enough; maps made by children who went on to be professional cartographers—that’s something else altogether, as All Over the Map’s Betsy Mason shows. Because you know they all did that, when they were kids. (And no, before you ask, I don’t think any of my childhood cartography still survives.)

Previously: Children Map the World: The Book; Children Map the World, Volume Two; 19th-Century Children’s Maps.