The BBC Wales Big Picture features digital images of bridges in Wales at the moment. I've searched Coflein for interesting images of bridges across Wales - and found this fantastic black and white image of the Monnow Bridge and gateway. The date and origin of this image isn't known but we have a copy in the National Monuments Record of Wales site files. If you are interested in a particular bridge in Wales you could try searching Coflein for any information we may hold - or contact our free public enquiry service.
I haven't forgotten that I've been asked to post more great images of Cardiff - will get onto it soon.