The historic city of Venice is built on millions of wooden piles driven deep into the clay beneath the Venetian Lagoon. Many of these timber foundations date back more than 1,500 years — yet they remain structurally stable and as hard as stone. The secret lies in the oxygen-poor underwater environment. Submerged wood does not rot when deprived of oxygen, and over centuries, minerals in the water gradually replace organic material in a natural petrification-like process. On top of these piles, th