When looking through the 534 "Mum" images at Acclaim Images.com this Alcatraz Island was a favorite.
All of their pictures are hand picked, availiable in a number of formats, and you can even get custom prints and posters.

Description:
Alcatraz Island
Stock photo of Alcatraz Island in San Francisco Bay, California.

Some related terms for more images:
bay area,  landmark,  security,  jail,  san francisco,  maximum security,  america,  california,  alcatraz,  prison,  fred voetsch,  architecture,  islands,  secure,  alcatraz island,  tourist attractions,  prisons,  isolated,  san francisco bay,