Notre Dame cathedral is pictured from the top of the Montparnasse tower, Tuesday April 16, 2019 in Paris. Firefighters declared success Tuesday morning in an over 12-hour battle to extinguish an inferno engulfing Paris' iconic Notre Dame cathedral that claimed its spire and roof, but spared its bell towers. (AP Photo/Thibault Camus)
Notre Dame cathedral is pictured from the top of the Montparnasse tower, Tuesday April 16, 2019 in Paris. Firefighters declared success Tuesday morning in an over 12-hour battle to extinguish an inferno engulfing Paris' iconic Notre Dame cathedral that claimed its spire and roof, but spared its bell towers. (AP Photo/Thibault Camus)
The cathedral of Notre-Dame de Paris 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. The cause is unknown but officials said it was possibly linked to ongoing renovation work. (Photo by Chesnot/Getty Images)
Damage caused to Notre-Dame Cathedral following a major fire yesterday on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, causing the famous spire to collapse. The cause is unknown but officials have said it was possibly linked to ongoing renovation work. (Photo by Dan Kitwood/Getty Images)
Damage caused to Notre-Dame Cathedral following a major fire yesterday on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, causing the famous spire to collapse. The cause is unknown but officials have said it was possibly linked to ongoing renovation work. (Photo by Dan Kitwood/Getty Images)
A crane lifts experts as they inspect the damaged Notre Dame cathedral after the fire in Paris, Tuesday, April 16, 2019. Experts are assessing the blackened shell of Paris' iconic Notre Dame cathedral to establish next steps to save what remains after a devastating fire destroyed much of the almost 900-year-old building. (AP Photo/Kamil Zihnioglu)
The interior of the Notre-Dame Cathedral is seen through a doorway following a major fire yesterday on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, causing the famous spire to collapse. The cause is unknown but officials have said it was possibly linked to ongoing renovation work. (Photo by Dan Kitwood/Getty Images)
The interior of the Notre-Dame Cathedral is seen through a doorway following a major fire yesterday on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, causing the famous spire to collapse. The cause is unknown but officials have said it was possibly linked to ongoing renovation work. (Photo by Dan Kitwood/Getty Images)
Religious artifacts that were saved from Notre-Dame de Paris cathedral are stored in a room of the Paris City Hall on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. The cause is unknown but officials said it was possibly linked to ongoing renovation work. (Photo by Chesnot/Getty Images)
Employees load religious artifacts saved from Notre-Dame de Paris Cathedral into a truck before being transported to the Louvre Museum on April 16, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. The cause is unknown but officials said it was possibly linked to ongoing renovation work. (Photo by Chesnot/Getty Images)