Modern researchers have discovered that ancient Roman concrete behaves very differently from today’s materials, especially when exposed to water and stress. Instead of degrading, it can actually become stronger over time. The secret lies in the unique mineral composition of Roman concrete, which reacts with seawater to form new crystalline structures that naturally seal cracks. This self-healing behavior explains why many Roman structures still stand after nearly 2,000 years. From an environment

Ancient Roman concrete was engineered to last for millennia. | The History Page