How Ancient Rome Built Concrete That Outlasted Modern Versions

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Roman concrete has been getting stronger for 2,000 years — here's the wild reason why What's the most impressive ancient engineering feat you know about?

Transcript

Modern concrete starts failing in decades. The Pantheon has stood for two thousand years — no rebar, no repairs. Here's the part nobody expects — seawater is making it stronger over time. Volcanic ash in the mix reacts with seawater, growing new minerals that seal every crack. Follow along — history is full of things we forgot how to do.