After Monday’s fire, experts say the Notre dame in Paris could take 10-15 for the church to reopen.
One of the problems with the rebuild is that France no longer has trees big enough. The wooden roof that went up in flames was built with beams more than 850 years ago from primal forests.
The original Notre Dame cathedral roof was built using an estimated 1,300 ancient oak trees and an estimated 52 acres of ancient oak trees were cut down from 1160 to build roof.
The height of trees is determined by a number of factors, such as competition from its neighbors, environmental conditions, the availability of the right nutrients and also the genetics of the tree.
Certain individual trees within a species are likely to have genetics that allow them the grow taller than others.
If you remove the largest trees with these genetic predispositions, then only the smaller trees are left to pollinate.
Another important issue is the large scale deforestation that took place during this time period.
Many trees in the medieval forests of France during the period had been growing since the 7th and 8th centuries - meaning some of the timber in the destroyed frame and roof were as much as 1,300 years old.
Such vast amounts of timber were needed in the construction of churches, castles and ships during this period that much of France's ancient woodland was cleared.
This deforestation made the reconstruction of such a unique structure centuries later using similar materials even less likely.
On top of all that, people on the internet are swearing they see Jesus in photos of the fire. Lesley Rowan, from Alexandria in West Dunbartonshire, Scotland, was reading about the tragic incident when she claims to have noticed in one of the pictures a figure in the billowing smoke.