Are there any projects in the vein of Geograph https://geograph.co.uk/, OSM, Yelp, or Wikipedia for people remembering and preserving images and information about cities, city blocks, buildings? Particularly for cities that are damaged by disaster or war, this seems like a valuable thing to do at the granularity of "the unit that individuals photograph, remember, share with one another".
It would be good to have a freely-licensed structural history of a city in this fashion, block by block. And something that refugees from a crisis could do to preserve areas they frequented.
SJ