Battery Townsley, located at Fort Cronkhite in the Marin Headlands of Sausalito, California, was a casemated battery that housed two 16-inch caliber guns, representing the pinnacle of American military technology in the 1930s. Completed in 1940, this top-secret battery played a crucial role in protecting San Francisco from air and naval attacks during World War II.
Although Battery Townsley became obsolete after the war due to advancements in long-range bombers and nuclear weapons, it has since been restored by the National Park Service and is open for visitors to explore and learn about its historical significance.
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