Where to use the Sinking City 2 Graveyard key

The Sinking City 2 Graveyard key can be a confusing thing to find, as you're nowhere near a graveyard when you get it and, if you haven't been exploring thoroughly, you could easily have passed by where it's for. You will need to find out where to use it though, as it will get you a vital item to progress the main story, as well as tie into the Sinking City 2 Printing Press side quest. But if you didn't clock the Graveyard gate when you passed it you could be a fair way beyond it in time and dis