On April 15 2019 a massive fire ravaged Notre-Dame's roof weakening its structure. A year later 200 scientists examine the battered stones—revealing construction secrets and uncovering enigmas. Researchers use 3-D software to solve Notre-Dame's mysteries and preserve its 800-year history.

Built in the 12th century Notre-Dame is a pinnacle of Gothic architecture. Fire challenged its stability destroying the roof and wooden frame yet it stands. Using 3-D animation and reenactments scientists and architects unveil the cathedral’s genesis and explore the structure behind the stone.

Before the flames the sacred monument Notre-Dame engaged all of the senses—with light height and acoustics. Now researchers strive to restore Notre-Dame’s soul: unveiling its true painted stone and ensuring that the world's most famous organ will resound within the cathedral’s walls.