Here's a story on BBC about Project Mosul to use crowd-sourced photos to virtually reconstruct objects destroyed in Mosul using photogrammetry. It's an opportunity to help with the virtual reconstruction of the lost artifacts.
The authors of Project Mosul are coordinating with several organizations to apply a similar scheme to virtually reconstruct other damaged cultural heritage sites. It would be better to document these sites before they get destroyed, but as the song said, "you don't know what you've got 'til it's gone."