Here are some maps from Eric Fischer’s Locals and Tourists project. He uses geotags from platforms like Twitter and Flickr and distinguishes between people who stay at a place for longer (Locals) or shorter (Tourists) than a month.
You can zoom from a global scale right into a city of your choice and withdraw the whereabouts of locals and tourists. The example below shows the world, Europe, and London.
Find out more about Fischer and his work here.