Graffiti on some of the world's most amazing historical landmarks is expressly forbidden, except on The Great Wall Of China.
This article titled “Graffitists who leave their mark on history may have had their time” was written by Jon Henley, for The Guardian on Tuesday 4th March 2014 17.51 UTC
Our urge to scrawl on a wall has been around for pretty much as long as there have been walls around for us to scrawl on. The workmen who built the Great Pyramid of Khufu at Giza left behind scribbles that may explain how they did it. An ancient Roman scratched what is often interpreted as directions to a nearby brothel into the paving stones at Ephesus, while others were leaving declarations of love, political slogans, rude gossip and scandalous accusations all over Pompeii.