Ewa Bauer, chief engineer at the Golden Gate Bridge, talks about the bridge's extensive seismic retrofit program at Vista Point in Sausalito, Calif., on Wednesday, April 25, 2012. (AP Photo/Eric Risberg)
The German-built zeppelin flies over the Golden Gate Bridge, arriving in San Francisco on Oct. 25 to begin aerial tours of the Bay Area. The airship is the first of its kind to fly in the United States in more than 70 years. (Associated Press)