Venice stands on millions of wooden piles

Venice appears to rise straight out of the water, but beneath its stone palaces lies a hidden forest. Builders drove countless wooden piles deep through the soft silt of the lagoon until they reached firmer clay, then laid stone platforms on top to carry the city above.

The basilica of Santa Maria della Salute alone rests on a platform of about 1,000,000 wooden piles. The grand church is one of countless structures founded this way across the city’s islands.

Submerged in oxygen-poor mud, the timber never rots — instead it slowly mineralises, hardening toward a stone-like state over the centuries.

Wood normally decays within years, but the lagoon’s saltwater-saturated, low-oxygen conditions starve the fungi and bacteria that cause rot. That natural preservation has let Venice’s medieval foundations support its weight for hundreds of years.