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St John's Gate, Clerkenwell, 1870s and now

St Giles, Cripplegate, 1870s and now

Great St Helens, Bishopsgate, 1870s and now

This is a fantastic project by the British Library: photographs of spots around London, then and now. The photographs from the 1870s were taken by Henry Dixon. A description of the changes, and more examples, are here.