Ulrich will knock three times on the door of Notre-Dame with a staff made of charred wood salvaged from the cathedral’s fire-ravaged roof. After each knock he is greeted with a rising tide of choral chants before the doors finally swing open.

The cathedral’s thundering organ, whose 8,000 pipes have been carefully restored and cleaned of toxic dust, will also answer the archbishop’s call, with four organists playing various tunes.

A new altar and gold cross were also installed, while fire doors and sprinkler systems are a modern addition. The Crown of Thorns, said to be the wreath placed on the head of Jesus Christ during his crucifixion and one of the cathedral’s holiest objects, will rest in a sparkling reliquary.

Ariel Weil, the mayor of Paris Center, said of the historic building: “A page has been turned and we are closing this chapter.”

Weil said he was one of the first to arrive at the scene of the fire after seeing a line of fire trucks racing toward the cathedral, adding that he was shocked to see the flames.

“Something rained down on us. It was rubble. To this day, I’m not entirely sure what it was,” he said, adding that he implored onlookers and residents to get away from the construction site to safety.

Like thousands of Parisians and tourists that night, he watched helplessly as the inferno swept across one of the French capital’s most famous sights.

For Emily MacKinnon, a self-proclaimed Notre Dame superfan who moved from the Canadian city of London to Paris to be closer to the famous cathedral, it was the “worst day of my life.”

But she said: “Given the size and scale of this fire, we could have lost so much more than just the roof and the tower.”

The 29-year-old, who plans to attend the opening ceremony, said she was filled with gratitude over the restoration of the cathedral, which she fell in love with as a fourth-grader when she wrote a school project about it.

When she saw the musical “Notre-Dame de Paris” on stage for the first time, her passion solidified and she said she has collected more than a thousand pieces of Notre-Dame memorabilia.

“It was just everything — my whole life was Notre Dame,” said MacKinnon, who now runs her own tour company around the cathedral.