Ancient Megastructures (National Geographic): Petra

In 1666, in London, thousands of people fleeing the fire, devouring the great cathedral. Fire destroys this monumental architecture. But the new miracle of architecture rises from the ashes and will rise above one of the richest cities in the world. As the first and largest Protestant church, it will be unchanged part of the London landscape. Erection of a huge dome will become a matter for the architect of all life. Each time the church will be on the verge of destruction, he will look for engineering solutions. It is a risk, putting into practice the revolutionary ideas, to realize its tremendous dream.
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