2. Roman Concrete
Roman concrete, or opus caementicium, is legendary for its incredible longevity. Unlike most modern blends, the Romans mixed volcanic ash into their concrete, granting it remarkable durability. This innovation allowed masterpieces like the Pantheon and ancient aqueducts to stand for millennia, defying the ravages of time. Researchers continue to study this lost formula, as BBC reports, seeking to unlock the secrets behind Roman engineering’s lasting legacy.
