Top 16 Hidden Treasures: Surprising Discoveries That Inspired Netflix Documentaries!

12. Italian Town Hall's Lost Mural Hidden Behind a Wall

Where: Florence, Italy Year Found: 2012 Estimated Value: $100–400 million* When researchers peered beneath Florence, Italy's City Hall's walls in 2012, they uncovered an unexpected find. They discovered a mural painted by the well-known Italian artist Leonardo da Vinci, who unveiled yet another legendary painting.

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Italian Town Hall's Missing Mural Hidden Behind a Wall ©Images from Heritage/Getty Images The sixteenth-century fresco, which had been concealed for decades without being discovered, was verified by the high-tech effort. Some people think that the mural honours Florence's triumph over Milan at the mediaeval Tuscan town of Anghiari in the fifteenth century. It is unclear why Florence covered the Da Vinci mural in frescoes. Despite its beauty, the painting is incomplete because Da Vinci left Florence in 1506.