In this July 13, 2011 photo, tourists photograph each other on a hill with a view of the Hollywood sign in Los Angeles. With more than 50 miles of free hiking trails, many of them winding through chaparral-covered canyons and over hillsides, Griffith Park bills itself as the largest urban wilderness in the United States. (AP Photo/Damian Dovarganes, File)

Associated Press
In this July 13, 2011 photo, tourists photograph each other on a hill with a view of the Hollywood sign in Los Angeles. With more than 50 miles of free hiking trails, many of them winding through chaparral-covered canyons and over hillsides, Griffith Park bills itself as the largest urban wilderness in the United States.  (AP Photo/Damian Dovarganes, File)
In this July 13, 2011 photo, tourists photograph each other on a hill with a view of the Hollywood sign in Los Angeles. With more than 50 miles of free hiking trails, many of them winding through chaparral-covered canyons and over hillsides, Griffith Park bills itself as the largest urban wilderness in the United States. (AP Photo/Damian Dovarganes, File)
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