There was (is) a giant cross on Mt Davidson, and it might still be there.
The legal wrangling went on for years, But I believe that the cross is still in place. It was used every year for sunrise Easter services, as I recall.
Does anyone know its present status?
Some google results for "mt. davidson cross"...
http://www.atheists.org/flash.line/sfcross7.htm
http://www.ancsf.org/pressreleases/2004/01232004.htm