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This is also a great resource for a project like this: https://www.oldmapsonline.org/

These are mainly links to georeferenced raster images and databases, not vectors / OSM data. But, still -- I've already spent hours browsing old maps of my home city. For anyone interested in contributing to this project, oldmapsonline might be a great reference.

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For the UK, the National Library of Scotland’s historical maps are a fantastic resource:

https://maps.nls.uk/

Ireland’s Ordnance Survey also has some good historical resources:

https://www.osi.ie/products/professional-mapping/historical-...

This is cool. For my hometown Berlin I love to browse this map https://1928.tagesspiegel.de/ it shows Berlin in 1928 and most areas are still the same.

Yeah, it's very intersting indeed. Roads and street layouts usually don't change that much over the centuries -- they get integrated and amended, but seldom disappear. I was pretty amazed to recognize the street layout of Leipzig in the 1740ies: https://biblio.unibe.ch/web-apps/maps/zoomify.php?pic=Ryh_53...

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