Greg giving a lesson in archeology... notice he has a book in his hand (what a cheater). He is pointing out that this arch is constructed (and reconstructed) without using any kind of cement to hold it together. He is pointing to the middle stone is first held up by posts and then all of the other stones would be added to the arch. The middle stone is shaped in such a way that it holds the entire arch together. This stone is called the "key-stone" or also know as the "cap-stone". Sound familiar?
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