I’m in London for the weekend to see the niece. This morning we went to the Tate Modern’s Global Cities exhibit — a social geographer’s dream and a wonderful place for toddlers to explore. It’s a bit like Google Earth unplugged: population density maps you can climb, and big glorious imagery of cityscapes on the walls. Worth a visit if you are in town (until August 27). Some pics below, but here’s the whole set on Flickr.