PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: Firefighters secure the Notre-Dame Cathedral the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )

PARIS, FRANCE - APRIL 16: The Notre-Dame Cathedral is seen the day after the massive fire that ravaged its roof on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. ( Mustafa Yalçın - Anadolu Agency )