Just in time for your city-based vacation planning, Flickr user Eric Fisher has provided maps of the most popular places locals and tourists photograph for a number of major cities. If nothing else, it'll tell you why your photos look ones you've already seen ;~). It strikes me that so many people are geotagging these days that you may no longer need a GPS! All we need is image analysis software, which should be able to use existing geotagged images on public sites to locate with modest precision where you took yours. That certainly should work for city locations at this point. Hmm, crowd-source geotagging.