Construction Workers Accidentally Discovered a Pair of Priceless Lost Renaissance Frescoes
The pieces were found at the Uffizi Gallery, which is in the midst of an extensive restoration project
architecturaldigest.com

While working on an extensive restoration project at the world-renowned Uffizi Gallery in Florence, a couple of construction workers happened upon two Renaissance-era treasures: a pair of frescoes depicting none other than Duke Ferdinando I de Medici and his son Duke Cosimo II de Medici, both of whom ruled over Florence in the 16th and 17th centuries, respectively. The two long-lost portraits had been covered up by plaster sometime during the 18th century, which was not unusual during that period of time.

No illustrations of the frescoes, unfortunately.