Enigma.

More than 500 years after it was built, Filippo Brunelleschi's dome of Santa Maria del Fiore in Florence, Italy, remains the largest masonry dome ever built. Leaving no plans or sketches behind, some of the secrets of its construction that Brunelleschi pioneered are still an enigma today.

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Author and historian Ross King talks about Filippo Brunelleschi and the construction of Santa Maria del Fiore's dome ...

 An excellent book ...