"Mini dome" may be clue to Brunelleschi building secrets

A team of Italian archaeologists has uncovered the remains of a "mini dome" during excavations to expand the museum of Florence’s cathedral, designed by Filippo Brunelleschi in the 15th century. The structure might be a scale model of the cathedral and the first use of a building technique in Italy.

“Although at the moment we cannot confirm the small dome was the demostration model for Brunelleschi’s plans, it did belong to the yard he created between 1420 and 1436, when he worked at one of the most incredible feats of engineering,” said Francesco Gurrieri, professor of Restoration of Monuments at the University of Florence.