While motorcycling on the Atlantic coast of France I was struck by the lasting legacy of the U-Boat pens which remain since the Nazi occupation during WW2. I was surprised that these reminders of darker times had not been removed from the post-war landscape but on looking more closely it became apparent that removing these massive structures located in busy working ports would have been so disruptive that they were just worked around instead. Different towns have shown different approaches to living with the U-Boat legacy, some have developed facilities inside and even on top of these behemoths, others have fenced them off and worked in the space outside their footprint.