Do the preparation exercise first and then read the article. If you find it too easy, try the next level. If it's too difficult, try the lower level. After reading, do the exercises to check your understanding.
Before you read the article, do this exercise. It will help you to understand some of the more difficult words.
A long history
Painting and writing on walls is nothing new. In prehistoric times, people in Africa and Europe painted pictures of animals and people in caves. Graffiti has been found at ancient sites in Greece, Italy, Syria and Iraq. In the Roman town of Pompeii in Italy, archaeologists found a lot of graffiti written in Latin, including political and