Carved from 100 million pounds of stone, soaring effortlessly atop a spiderweb of masonry, Gothic cathedrals are marvels of human achievement and artistry. But how did medieval builders reach such spectacular heights? Using simple hand tools and stone, entire towns took sometimes 100 years to erect some of the most beautiful structures on earth.
NOVA's teams perform hands-on experiments to investigate and reveal the architectural secrets and hidden formulas, drawn from the pages of the Bible itself, that drove medieval builders ever upward...8pm
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