I should point that OSM does include Tyburn path (which seems to be a combination of modern day sewers and original paths, and is missing 2 of 4 ends), but you

I should point that OSM does include Tyburn path (which seems to be a combination of modern day sewers and original paths, and is missing 2 of 4 ends), but you have to know where to look, and how to look for it in such a busy area. What's more important, OSM approach is different: objects are presented as they are, and can't collect arbitrary comments, discussions, photos and other data (apart from regular edit descriptions). It is essentially a tool to make a static snapshot of current state of certain types of objects, which is fine for a map, but does not help people interested in local history. It seems strange to me that something so useful and customary is virtually inconceivable in the “developed world”.