The Mulberry Harbors are a subject that in large part have been all but ignored by many historians. The sole purpose of these British designed and built prefabricated seaports was to support the Allied landings in Normandy, France where the remnants can still be seen today. The story of how this remarkable piece of engineering evolved from being a controversial and often ridiculed theory into a controversial and often ridiculed reality is as entertaining as it is informative.