External anchor link or map for attached images
You can copy the templates views uses to your theme and modify them so that a field returned in the view is used to theme another.  Views has this built in in its latest versions, but only allows divs, spans, etc, and you want an anchor.  Check out Exposing Individual Fields on Output for Styling here for an example of what I am talking about.  There they wanted to just wrap an in a div to set the color, but you could use the same concept to wrap it in an anchor.