While firefighters were able to save the crown as Monday's massive blaze tore through the building in the heart of Paris, the fate of other items inside the 850-year-old Gothic cathedral is unclear.
Certain items were evacuated from the cathedral and stored in the nearby Hotel de Ville (see below) during the fire.
France's Culture Minister Franck Riester said that the rest of the treasures would be stored at the Louvre on either Tuesday or Wednesday.
Here's an overview of some of the treasures contained in the venerated Notre-Dame (Our Lady) Cathedral:
Its most precious item, the Holy Crown of Thorns, is about 21 centimetres (eight inches) in diameter and made up of rushes braided together and bound by gold wire.
Firefighters who were directed to the cathedral's most treasured objects rescued the crown as well as a tunic worn by 13th-century French crusader king, Louis IX, who was made a saint.
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The Holy Crown of Thorns. Photo: AFP
Notre-Dame also held two other relics said to be from the crucifixion of Jesus: a piece of the cross on which he was nailed and one of the nails.
There were three holy items in the spire that collapsed in flames on Monday: a fragment of the Crown of Thorns and relics from Saint Denis and Saint Genevieve, two of the city's most cherished saints.
The Great Organ
Of the cathedral's three organs, the most impressive is the Great Organ with five keyboards, 109 stops and close to 8,000 pipes.
Built in the 15th century, the organ was progressively added to over the centuries to become one of the largest in France.
It survived the 18th century French Revolution unscathed, even though the building was vandalised, “thanks no doubt to its use in playing patriotic music,” the cathedral website says.
Culture Minister Franck Riester said the organ “seems to be quite badly damaged”.
The Great Organ. Photo: AFP
The cathedral's three impressive stained glass circular rose windows were built in the 13th century and renovated several times.
The one on the south appeared to be intact on Tuesday, as did another on the western facade which lies between the two stone towers which can be climbed by tourists on the front of the cathedral.
AFP was unable to verify the state of the northern window.
They show prophets, saints, angels, kings and scenes of the daily lives of holy figures. At the centre of each is an image of either the Virgin Mary, Christ as a baby or Christ as king reigning over heaven.
The largest and oldest of the cathedral's bells is known as the Bourdon Emmanuel. Cast 300 years ago, it weighs 13 tonnes, its clapper alone being 500
kilogrammes (1,102 pounds).
The tenor bell, considered one of the finest examples in Europe, is chimed only on special occasions and important Catholic events, and was joined in 2013 by nine new bells.
It only just managed to avoid being melted down during the revolution and rang out to announce the liberation of Paris from German occupation in 1944.
The level of damage to the bells is not known but the cathedral's two square bell towers escaped relatively unscathed.
37 figures of Virgin Mary
A mid-14th century statue of the Virgin with Child, placed in the sanctuary, is the most famous of the 37 images of the Virgin Mary contained in the cathedral.
Another depicts Mary holding the body of her son descended from cross, created by French sculptor Nicolas Coustou between 1712 and 1728 and positioned behind the choir altar.
It is not known how many, if any, of the images were damaged.
One good piece of news is that 16 of the cathedral's bronze statues – representing the 12 apostles and the four evangelists from the New Testament – were removed in a rather dramatic fashion on Friday and are currently being stored in Bordeaux (see below).
Previously they sat around the spire which collapsed dramatically during Monday night's fire.
Between 1630 and 1707 the Paris goldsmith guild presented the cathedral with a painting on every May 1. Of these 76 works called “The Mays”, 13 were
displayed in various chapels in the cathedral.
On the west wall of the Chapel of Saint-Guillaume is the one of the most beautiful paintings in the cathedral, the “Visitation” by Jean-Baptiste Jouvenet (1716).