oh god, peter as a history tour guide… now i can’t help but imagine an au where, for x reasons, still-functionally-immortal-nightingale is taking part on one of peter’s tours and accidentally ends up correcting peter on some historical tidbit about whichever building they’re at, so peter’s of course like, “that is very interesting, sir, how did you know that?” and nightingale just goes, “… not by being alive at the time, that’s for sure.”