I am A Nerd

Friend: "Hey, I'm playing Assassin's Creed and there's this tower I don't recognise. Help?"

Me: "When/where is this?"

Friend: "1792" *sends screencaps of the tower; including a view from the Pantheon to Notre-Dame*

[snip some back and forth as I flounder for a bit]

Me: "Is it the Commanderie de Saint-Jean-de Latran?"

Friend: "It is! Thank you; I'm off to rob the Châtelet."

Me: "Have fun storming the castle!"