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Construction for Notre Dame started in 1163. it was opened in 1345. Notre-Dame de Paris was among the first buildings in the world to use the flying buttress (arched exterior supports). The building was not originally designed to include the flying buttresses around the choir and nave but after the construction began, the thinner walls (popularized in the Gothic style) grew ever higher and stress fractures began to occur as the walls pushed outward.

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10y ago

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