The Roman Empire collapsed over 1,500 years ago… but their buildings and bridges are still standing — while ours crumble in decades. What was their secret? 🏗️ Modern scientists discovered that Roman concrete contained lime clasts — tiny pockets of quicklime that react with water. When cracks form, rain triggers a chemical reaction that lets the concrete heal itself. 🧱 From aqueducts to harbors, ancient Romans were building materials we still can’t fully reproduce today. They weren’t just builders — they were engineers centuries ahead of their time. ⚡ Subscribe to Redline History for more short, shocking truths that rewrite what you thought you knew about ancient technology. #RedlineHistory #AncientRome #RomanConcrete #HistoryFacts #Archaeology #ScienceFacts #Engineering #Shorts #DidYouKnow #TrueFacts #WeirdHistory #HistoricalMyths #HistoryRevealed #EducationalShorts #RomanEmpire #ancienttechnology Impact Moderato by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/...