https://rcd.typepad.com > Travel 2004 (Autodesk University Trip)

Alcatraz lighthouse

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.