I finally had the opportunity to visit what was once the strongest fortress in Europe, Fort Eben-Emael in Belgium near the German border. I featured the story of this fortress in my 2007 film, Silent Wings - The American Glider Pilots of WWII. In May, 1940 Hitler devised a bold plan to land gliders on the top of this underground fort during WWII. These gliders carried infantry and the new one hundred pound hollow-charge bomb. The fort, considered impenetratable, was breached in 20 minutes. And the battle was over in a day. The seizing of this fort dealt a great psychological blow to the allies and German troops now had an open road to the French coast which they reached in 10 days.