Vandalism, sadly, gets everywhere !
I spotted this piece of graffiti, saying "Sam", above the doorway of an ancient Guardhouse on the Great Wall of China.
This is the Mutianyu section of the Great Wall , north west of Beijing.
This section of the Wall was rebuilt in 1569, in the Ming Dynasty.
Two cable car routes transport visitors up to the edge of the Wall, and you are free to walk left (up) or right, (down) for as long as your legs can stand the many thousands of steps!