This is a twenty second time exposure of the south tower of the Golden Gate Bridge. You can see the communications tower on Twin Peaks behind and to the left of the Golden Gate tower.
Taken with a telephoto lens (the 150mm focal length I used translates to 225mm in 35mm terms), the hilly terrain of San Francisco appears compressed.
I was positioned a couple of miles up the Coastal Trail, looking back at the Golden Gate Bridge. The bridge tower is framed by the ridges of the Marin Headlands.
Related stories: Gerbode Valley; S-Curve.