Interested in visiting sites of urban ruins? That is old factories, warehouses and other abandoned buildings and infrastructure. While there guided tours, most of this kind of tourism is more for the renegades, those willing to trespass. Want to learn more? visit....
https://www.uer.ca/ World wide.
http://www.forbidden-places.net/explo1.php US and Europe.
https://www.theurbanexplorer.co.uk/ For UK.
Be careful.