Weekly Photo Challenge Ascend For this Challenge I offer an image from a resent nightmare visit to Yerba Buena Gardens in San Francisco. In the foreground you see the waterfall that is part of the Martin Luther King Jr, Memorial! Behind that is The Museum Of Modern Art and ascending above it all is Salesforce Tower The tallest building in town. Everyone in the Bay Area is feeling in the dark with the loss of San Francisco Mayor Ed Lee. Who has done a lot to shape this skyline.