What you cannot see is the Severn Railway Tunnel. To the left of this picture is the large Victorian red brick building housing the pumps which extract daily the spring water from the tunnel. The actual tunnel portal is some distance from here adjacent to Caldicot Railway Station. If you wish to take a photograph of the tunnel portal then take a pair of steps with you! The parapet of the road bridge over the line has been raised, quite considerably.
The bridge, the longest river crossing in Britain, going over the longest river in Britain. Opened by HRH Prince Charles in 1996.