#ThrowBackThursday Ancient San Francisco (50 BC +/-).. Or: Perhaps it was the Romans not the Vikings that discovered North America ? #AltText #NoAI #No2AI #photo #photography #travel #us #usa #travelphotography #sf #sfba #photooftheday #potd #california #bnw #history #historic #sanfrancisco #leftcoast #BlackAndWhite #abstract #monochrome #architecture #blackandwhitephotography #abstractPhotography #architecturalphotography #ancientrome