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Why did the Europeans build their castles and cathedrals out of laboriously worked stone instead of concrete, considering the Romans had already invented it?

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Why did the Europeans build their castles and cathedrals out of laboriously worked stone instead of concrete, considering the Romans had already invented it?	196
How was Roman concrete technology lost to European civilization. Was it an economic outcome? Were there simply no large scale public works being commissioned so the craft ceased being passed down?	0