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But while most visitors will be marveling at the cathedral’s rebuilt roof and radiant stonework, behind the scenes a sprawling scientific enterprise has yielded surprising insights into Notre Dame’s past.

Robbie Mitchell, a reference assistant at the library, said that inside the passageway you could see the brickwork of the library's lower levels and the bridge’s stonework.

The most striking feature of the renovated cathedral is the luminosity of the stonework.

The prosecution said the dye not only turned the water red but also stained the stonework of the fountain.

"There was stonework crumbling, also the great clock hadn't had a major overhaul in over 30 years at that point."