Built between 1851 and 1863, during the height of the Gold Rush, the Fort at Fort Point was slated to be torn down to make way for the Golden Gate Bridge. Chief Engineer Joseph Strauss designed an engineered arch to span the fort and saved it from demolition. On October 16, 1970, Fort Point became a National Historic Site.
This view of the fort from the South Anchorage roof is through the arch that saved it.
Photo Notes: iPhone 5 camera, shot with Camera+ app, edited in Snapseed and CameraBag2.