This was a great question. I believe that the Notre Dame Cathedral should be rebuilt with a similar gothic design as before, but with a modern touch. I like the idea of using sustainable, environmentally friendly materials in the construction process because as things are constituted now, construction processes can be very detrimental to the environment. Also, along with the new, more modern touch to the structure there should be a plaque or item that commemorates the older structure before the fire, while also providing context as to why a more modern touch was added to the cathedral. I really liked the plan put forth by Vincent Callebaut Architectures making use of the gothic architectural style, along with adding a biomimetic forest for the cathedral.