This bridge in Finland has hooks to hang explosives from in case it needs to be collapsed to stop Russian advance

https://feddit.uk/post/45082376

I have heard the same thing about semiconductor factories in Taiwan. Don’t know if it’s true or urban legend. 
Wouldn’t surprise me - their chip foundries are the most robust defense they have. If they were gone, Taiwan would be “just another Island that will cause you loads of headache internationally and because of a nearly guaranteed resistance - and you expended a lot of resources for it on top”