Google maps have released a gallery of maps showing various features. One that might be more interesting to many here is the one of London in 1891. You can zoom all the way in, each building is individually marked, and can even search for the street you want. Might be quite helpful :D
http://maps.google.com/gallery/detai...Tef2F49I&hl=en
http://maps.google.com/gallery/detai...Tef2F49I&hl=en
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