Near most European battlefields you will find tour operators and battlefield guides, specializing in taking (history)tourists along over the old battlefields and landmarks, telling and showing the history. Below are a number of the organizations/persons that I have found.
Italy – Dr. Danila Bracaglia organizes tours to Monte Cassino, Salerno and Anzio. She also has a wonderful website with lots of information about the battles in Italy and her tours.
Italy – Dr. Roberto Piccione is a guide specialized in WW2 tours on Sicily, specifically – but not limited to – the area around Syracuse. He set up an ‘association’ for his activities and you can get all necessary information from his website at www.impavidus.it.