When the roof of the Notre Dame Cathedral in Paris erupted into flames in April 2019, firefighters battled the fire for nine grueling hours to save the historic landmark. Still, France came alarmingly close to losing more than 800 years of history. Now engineers and scientists are racing to protect, and ultimately rebuild, the medieval structure. But it's a complicated and dangerous task. See how they study the components of the iconic structure to figure out how best to repair it.
Watch Saving Notre Dame on NOVA, tonight at 9pm on GBH 2