Half a decade after a fire ripped through Notre Dame Cathedral in Paris, damaging large portions of the 860-year-old Gothic-style building, the world is getting a look at the painstaking restoration efforts to bring the church back to life.

French President Emmanuel Macron toured the UNESCO World Heritage Site Friday, trailed by a pool of photographers and journalists, taking in the meticulous, €700 million (more than C$1 billion) restoration.

And what a difference – “This is overwhelming,” he said as he viewed the glistening, cleaned white stones, Reuters reported.

French President Emmanuel Macron takes in the restored interiors of the Notre-Dame de Paris, Friday Nov. 29, 2024, in Paris.

French President Emmanuel Macron takes in the restored interiors of the Notre-Dame de Paris, Friday Nov. 29, 2024, in Paris.

Stephane de Sakutin / The Associated Press

Macron thanked the nearly 400 firefighters who “saved this cathedral” on April 15, 2019 – the day the world watched in horror as a fire that started in the roof spread rapidly, sending flames and smoke high into the sky.

“The blaze at Notre Dame was a national wound and you were the remedy, through your determination, hard work and commitment,” he said, speaking to the approximately 1,300 workers who gathered to welcome Macron and celebrate their achievements.

Attendees including workers of reconstruction of Notre-Dame de Paris cathedral gather during a speech by French President Emmanuel Macron (C) in the nave of the cathedral in Paris, on November 29, 2024. The Notre-Dame Cathedral is set to re-open early December 2024, with a planned weekend of ceremonies on December 7 and 8, 2024, five years after the 2019 fire which ravaged the world heritage landmark and toppled its spire.

Attendees including workers of reconstruction of Notre-Dame de Paris cathedral gather during a speech by French President Emmanuel Macron (C) in the nave of the cathedral in Paris, on November 29, 2024. The Notre-Dame Cathedral is set to re-open early December 2024, with a planned weekend of ceremonies on December 7 and 8, 2024, five years after the 2019 fire which ravaged the world heritage landmark and toppled its spire.

Sarah Meyssonnier / APF via Getty Images

The fire destroyed the church’s spire and roof and left heavy smoke and water damage to the main cathedral area of the building.

After the fire was extinguished that day, Macron pledged to the public that “we will rebuild the cathedral to be even more beautiful, and I want it to be completed within five years.”

On Friday, Marcon gazed up at rebuilt soaring ceilings and creamy good-as-new stonework.

This photograph shows a new altar (front) designed by French artist and designer Guillaume Bardet, at the Notre-Dame de Paris cathedral, in Paris on November 29, 2024. The Notre-Dame Cathedral is set to re-open early December 2024, with a planned weekend of ceremonies on December 7 and 8, 2024, five years after the 2019 fire which ravaged the world heritage landmark and toppled its spire.

This photograph shows a new altar (front) designed by French artist and designer Guillaume Bardet, at the Notre-Dame de Paris cathedral, in Paris on November 29, 2024. The Notre-Dame Cathedral is set to re-open early December 2024, with a planned weekend of ceremonies on December 7 and 8, 2024, five years after the 2019 fire which ravaged the world heritage landmark and toppled its spire.

Christophe Petit Tesson / AFP via Getty Images

Gone are the gaping holes that the blaze scorched into the vaulted ceilings, leaving charred piles of debris. New stonework has been carefully pieced together to repair and fill the wounds that had left the cathedral’s insides exposed to the elements. Delicate golden angels look on from the centrepiece of one of the rebuilt ceilings, seeming to fly again above the transept.

The cathedral’s bright, cream-coloured limestone walls look brand new, cleaned not only of dust and harmful chemicals from the fire but also of grime that had accumulated for centuries.

Click to play video: 'Video reveals inside of Notre Dame after fire burns through cathedral'

Not an easy restoration

Before the restoration work could get underway, clean-up crews needed to get rid of dangerous toxins and make sure the building was safe enough for tradespeople to begin their work.

Powerful vacuum cleaners were used to first remove toxic dust released when the fire melted the cathedral’s lead roofs.

The spire engulfed in flames collapses as the roof of the Notre-Dame de Paris Cathedral burns on April 15, 2019 in Paris.

The spire engulfed in flames collapses as the roof of the Notre-Dame de Paris Cathedral burns on April 15, 2019 in Paris.

Geoffroy van der Hasselt / AFP via Getty Images

Fine layers of latex were then sprayed onto the surfaces and removed a few days later, taking dirt away with them from the stones’ pores, nooks and crevices. In all, 42,000 square metres of stonework were cleaned and decontaminated — an area equivalent to roughly six soccer fields.

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“It feels like it was built yesterday, like it’s just been born, even though Notre Dame is very old,” stonemason Adrien Willeme, who worked on the reconstruction, told The Associated Press.

“Because it’s been so carefully restored and cleaned, it looks really extraordinary.”

This photograph shows the vaulted ceiling of Notre-Dame de Paris cathedral in Paris, on November 29, 2024.

This photograph shows the vaulted ceiling of Notre-Dame de Paris cathedral in Paris, on November 29, 2024.

Sarah Meyssonnier / AFP via Getty Images

Craftspeople from all corners of the globe, masters in their respective trades, re-created tools used by the original builders of the nearly 900-year-old cathedral to ensure the rebuild matched exactly what was originally unveiled at its 1345 opening.

Drag the button to see before and after photos of the altar in the Notre Dame Cathedral.

“We’re using a mix of 13th-century tools such as the broad axes or dog walk — to finish all the surfaces, we’re using chisels and saws, mallets,” American carpenter Hank Silver told NBC News in April.

“Everything is finished by hand so that the result is an almost identical replica of the Gothic frame that was there.”

Carpenters worked like their medieval counterparts as they hewed giant oak beams to rebuild the roof and spire that collapsed like a flaming spear into the inferno. The beams show the marks of the carpenters’ handiwork, with dents made on the woodwork by their hand axes.

Some 2,000 oak trees were felled to rebuild roof frameworks so dense and intricate that they are nicknamed “the forest.”

French President Emmanuel Macron (R), accompanied by President of the "Rebatir Notre-Dame de Paris" public establishment Philippe Jost (L) visits the Notre-Dame de Paris Cathedral in Paris, on November 29, 2024.

French President Emmanuel Macron (R), accompanied by President of the “Rebatir Notre-Dame de Paris” public establishment Philippe Jost (L) visits the Notre-Dame de Paris Cathedral in Paris, on November 29, 2024.

Christophe Petie Tesson / AFP via Getty Images

Additional work remains

Scaffolding still clings to large areas of Notre Dame’s exterior, and cranes clutter the skyline around the cathedral.

This aerial photograph shows a crane next to scaffoldings on Notre-Dame de Paris cathedral a few days before its reopening, on November 25, 2024.

This aerial photograph shows a crane next to scaffoldings on Notre-Dame de Paris cathedral a few days before its reopening, on November 25, 2024.

Damien Meyer / AFP via Getty Images

Philippe Jost, who is masterminding the reconstruction, told The Associated Press that scaffolding at the base of the newly-restored spire will remain into 2025 and for another three years on the monument’s east side.

Click to play video: 'Notre Dame fire: Drone footage shows extent of damage'

And while some Parisians have expressed disappointment that the cathedral’s exterior doesn’t yet match the fresh interior, Notre Dame has been a construction site for many years — even before the blaze. Scaffolding was already in place in 2019 for a previous restoration effort that wasn’t completed because of the April 15 fire.

The grand reopening

An opening ceremony — to which celebrities and heads of state have been invited — is planned for the evening of Dec. 7, followed by days of special Masses to celebrate the reopening and to thank those who helped save and rebuild the cathedral.

The public will be welcomed to come see the restoration in the following week, with free, ticketed entry, before the cathedral returns to a regular liturgical program on Dec.16.

This photograph shows windows in the heart of Notre-Dame de Paris cathedral in Paris, on November 29, 2024.

This photograph shows windows in the heart of Notre-Dame de Paris cathedral in Paris, on November 29, 2024.

Stephane de Sakutin / AFP via Getty Images

“We are very eager to welcome the whole world under the roof of our cathedral,” Paris’ Archbishop Laurent Ulrich said in a message on the cathedral website, expressing the Church’s gratitude to all those who helped save it.

“On the night of April 15, hundreds of thousands of people committed themselves to what then seemed an impossible bet: to restore the cathedral and give it back its splendor within the unprecedented deadline of five years.”

Ulrich expects Notre Dame will quickly surpass its pre-blaze visitor numbers. He is bracing for 15 million visitors annually.

–with files from The Associated Press and Reuters