Further to my travels in the USA. Fort Point was on the list.
The U.S. Army Corps of Engineers began work on Fort Point in 1853. Plans specified that the lowest tier of artillery be as close as possible to water level so cannonballs could ricochet across the water’s surface to hit enemy ships at the water-line. Workers blasted the 90-foot (27 m) cliff down to 15 feet (4.6 m) above sea level. The structure featured seven-foot-thick walls and multi-tiered casemated construction typical of Third System forts. It was sited to defend the maximum amount of harbor area. While there were more than 30 such forts on the East Coast, Fort Point was the only one on the West Coast. In 1854 Inspector General Joseph K. Mansfield declared “this point as the key to the whole Pacific Coast…and it should receive untiring exertions”.
This fort also features in computer games such as GTA San Andreas, Watch Dogs 2 and Duke Nukem 3D.