If you are an old school dungeoneer then you really need to read this actual 10th Century account of a very Dungeons & Dragons adventure in a mysterious castle in Egypt (from Medievalists.net).
There are monsters (giant snakes and an automaton), treasure, riddles... the works!
Beyond the inspirational value of the story itself, from the brilliantly named Book Of Strangers, and the fact that it "confirms" D&D is real, I was particularly taken by this quote:
"It was popular in the medieval Middle East for people to inscribe poems and other writings in places like taverns and gardens, mostly anonymously."I can see my campaign world featuring a lot more graffiti in the future.