This famous image from WW2 shows the destruction of the vitally important Bielefeld railway viaduct.
The photograph shows the damage caused by one of Barnes Wallis's "earthquake bombs".
The "Grand Slam" bomb was designed for such situations where extensive conventional bombing had failed to destroy the target.
On March 14th 1945 his theories were proved correct.
This website details the history of the viaduct, it's importance to the German war economy and the attempts made to protect and destroy it.