Built in san pedro in south los angeles between 1943 and 1945, these bunkers were constructed along the coast as seacoast gun batteries to protect the port of los angeles from the german u-boats and hostile ships. the concrete structures are bermed into a hill and oriented to provide a clear 180 degree view of the coastline. Following WWII the artillery guns became obsolete and were replaced by a nike missle base on the site which itself was deactivated in 1974. Today the former military installation has been decomission and is being turned into a public park.