In a world-first for heritage technology, scientists at the University of Bologna have begun injecting bio-mineralizing microbes into the marble foundations of the Leaning Tower of Pisa. These engineered bacteria are designed to secret calcium carbonate, effectively 'self-healing' micro-fissures in the ancient stone that have been exacerbated by rising ground acidity.
This innovative preservation technique avoids the need for intrusive mechanical reinforcements. The microbes create a natural, biological grout that strengthens the structural integrity of the tower from within, providing a sustainable solution to prevent further subsidence and marble degradation in one of Italy's most iconic monuments.