During my tour through 8 Eastern countries, I was quite surprised when we visited Ljubliana in Slovenia ! I had never seen so many graffiti in my whole life, which covered nearly all houses and buildings. But it didn't look dirty at all, it was mostly real art and expressed what people had to say since the communists had left and now they had their "Freedom of Speech" !
This photo from Internet gives a nice overview of the city
Here is my post about Ljubliana
Linking to SOCS Linda G.Hill