My two cents worth, this is a great submission and some of these are already in game. There was a discussion here: Are these eligible?
These are no longer in use but do date back 100 years or more, often they have some protected status because of their history. The reason I think things like this make good wayspots is precisely because you might pass them by without giving them a second thought, but when you know the history it helps you to understand how the urban environment developed and will keep players looking for more.