The 12th-century cathedral is one the world’s most famous tourist attractions. It was undergoing restoration in 2019 when it was engulfed by flames.

Five years on, investigators are still trying to solve the mystery of what started the blaze at the French religious and cultural landmark.

Paris' Notre-Dame Cathedral will reopen on Dec. 7, five and a half years after a devastating fire destroyed its roof and spire and caused major damage throughout.