>>1206359Spend a shitload of time on Google maps / Street view and Bing maps (for cross referencing against Google, which is sometimes older).
If you want to find industrial stuff, look over the cities in Europe that are / were former industrial centres then take a roadtrip to check them out.
Belgium is a bit of a gold mine for Urbex stuff, especially Liege and Charleroi.
Pic related, clothing manufacturer in Abruzzo, Italy.