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Et is no exaggeration to speak of a pharaonic construction site. 500 people work every day in the Notre-Dame Cathedral in Paris. 500 others work in specialized workshops throughout France: architects, archaeologists, monument conservators, stonemasons, roofers, blacksmiths, geologists, master glaziers, restorers, scaffolders, industrial climbers, 3D specialists, coordinators, computer scientists and even a general.