Modern Marvels: The Maginot Line, a defensive string of forts with enfilading firepower, was built by France between WWI and WWII. Conceived by Minister of War Andr� Maginot, it was meant to forestall another German invasion until troops could arrive. But the French began to think of the line as a substitute for manpower. When Belgium declared neutrality and exposed France's flank, Germany was able to sidestep the line. We'll visit the "impregnable" line's forts, observation turrets, and underground railroads.

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Documentary, History