Rather surprised that this website had escaped my notice. Scans of famous correspondence through history. I don’t mean a copy of the Magna Carta - more like a copy of a letter Kurt Vonnegut wrote to his family from a repatriation camp after being rescued from Slaughterhouse Five. Or two responses from Isaac Asimov Jerry Kosinski upon being asked to “describe the sky.”
I haven’t wasted this much time since TV Tropes. Happy Holidays!