Not nearly as old or as historic, but I used to work in II WTC … never imagined it would be gone in my life time! Wish I'd taken some pics and kept some of my business cards with that address … but I didn't!
I also worked for a time on the grounds of Creedmoor PC, we were in the building that was the original home of the NRA! It has since been demolished, but I do have pics of it and used to regularly talk to folks down there that found old cartridges with metal detectors. Incidentally, for those who do not know, that is where the Americans won the international shooting competition for the first time. Previously the Irish and Scottish dominated the 1,000 yd matches (with open sights), with MZ firearms, but the Americans used breach loading firearms and won.
My heart ached when I saw the ND fire … Deja Vou all over again!