The Pantheon has stood for almost 2,000 years. The Tay Bridge - Scotland's "engineering marvel" - collapsed in about 18 months. Same era. Same ambition. Completely different outcomes. The difference wasn't the materials. It was what the engineers didn't account for. One team obsessed over load capacity. The other ignored wind resonance - a force no one had systematically studied yet. Engineering isn't just solving the problem you see. It's solving the ones you can't see yet.