A rounded vault that is forming the roof of a building or structure is called a dome and typically it has a circular base. This is a construction that only few people are masters for this type of construction so we can see many started constructions waiting for the professional to finish it. And they are waiting and waiting because not everyone would take the offer to build such a huge dome!  The images are showing how the constructing process looks like and why this is so hard and difficult for engineers and construction workers!

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