Great Cathedral Mystery (NOVA) - Opens in a new window
The dome that crowns Florence's great cathedral of Santa Maria del Fiore — the Duomo — is a masterpiece of Renaissance ingenuity and an enduring source of mystery. Still the largest masonry dome on earth, it is taller than the Statue of Liberty and weighs as much as an average cruise ship. Historians and engineers have long debated how its architect, Filippo Brunelleschi, kept the dome perfectly aligned and symmetrical as the sides rose and converged toward the center. To test the latest theories, a team of U.S. bricklayers will help build an experimental “mini-Duomo” using period tools and techniques.