Battery Crosby was completed and armed in 1900 with two 6-inch guns mounted on disappearing carriages. The battery was built to protect underwater minefields laid outside the Golden Gate during the time of war and against destroyers and minesweeper warships.

San Francisco is the City and County of San Francisco. It is the cultural, commercial, and financial center of Northern California. San Francisco’s 2019 population was at 881,549.

Alcatraz Island is a notable landmark in San Francisco Bay, California. It's famous for its former federal prison, which operated from 1934 to 1963 and housed some of America's most notorious criminals, including Al Capone and Machine Gun Kelly. The prison gained a reputation for being inescapable due to its isolated location and harsh conditions.

The Golden Gate Bridge opened to pedestrians on May 27, 1937, and to traffic the following day, May 28, 1937. At that time, it was the longest suspension bridge ever built. It is truly an engineering marvel, a structure of magnificence, grace, and beauty.

From its vantage point overlooking the spectacular Golden Gate, Fort Point protected San Francisco harbor from Confederate & foreign attack during & after the U.S. Civil War. Its beautifully arched casemates display the art of the master brick mason