Antonio da Sangallo, a Brilliant Engineer
On the edge of the Orvieto Cliff there is a small square in which only a cylindrical building exists, apparently quite anonymous. This structure, however, hides a “thing ingenious with fancy and wonderful with beauty” inside. This is how Giorgio Vasari (in the 1550 edition of his Lives of the Most Excellent Painters, Sculptors, and Architects) ends the description of this fascinating work of architecture and engineering: a well dug deep into the tuff.