Historic SF murals: How many of these treasures can still be found today?

San Francisco has always attracted artistic types. And, sometimes their art adorned public spaces. It's hard to imagine a Robert Crumb mural surviving public exposure. But, his art, along with many others, such as the famed sculptor, Benny Bufano, have brightened the landscape and public interior spaces for decades. Most of the interior artwork still exists. But, much of the external artwork is gone due to vandals, time and changing public tastes.