The Yerba Buena Island Lighthouse and keeper's quarters as seen from the San Francisco Bay, Aug. 22, 2020. Constructed in 1875, Yerba Buena Island Lighthouse is the only freestanding wood-frame lighthouse tower still operating in California and the former keeper's quarters is now home to the Coast Guard’s commander, Pacific Area. U.S. Coast Guard photo by Petty Officer 3rd Class Aidan Cooney.