Furthermore, San Francisco is also the city of art. Many famous museums and paintings are even existed in life of people of San Francisco. If you have chance to go town of hispanic people (I recommend you to go), there are wall paintings like picture below in everywhere. Decades ago, many hispanic and african people were hard to live in American society. So lots of them show their anger by these kind of pictures. It means they expressed their complains about the society and world. If you like art, here is nice place to walk around.
Wall painting in Mission Street