The Arts District in Downtown LA is known for its massive murals by established artists such as Banksy, JR, Anthony Lister, as well as countless others. However, there's tons of wheat paste in the area too, so be sure to scout it out and soak it all in if you're there. Various artists (local Angelenos as well as visitors) have made their mark creating a visual mecca of social and political commentaries. Definitely worth checking out.