That's right, Pompeii. The catastrophic eruption of Mount Vesuvius in A.D. 79 buried the city but preserved a unique look at daily life in the ancient world, including its residents' casual scribblings. Since the city's walls and buildings were brightly painted, folks carved their words into them, exposing the white plaster beneath.
According to a recent article in Smithsonian magazine, messages were carved inside and outside homes, public buildings, and the city's walls. This graffiti included friendly greetings, declarations of love, political commentary, poetry, jokes, and good wishes, carved by both the city's elite and it's regular folks.