Alcatraz lighthouse
23/11/2004
Alcatraz, San Francisco
In 1909 the original lighthouse was torn down to make way for the construction of a prison. An 84 foot tower of concrete was built next to the cellhouse, and was lit with a smaller fourth-order lens on December 1, 1909. Keepers continued to serve on Alcatraz until 1963, when the light was automated, and the fresnel lens was replaced with a rotating beacon.
