Add Yahoo as a preferred source to see more of our stories on Google. Researchers still puzzle over exactly how Roman concrete was made, but they have a few clues, including many of its ingredients ...

So, Roman concrete just... won't fall. The Pantheon is still standing. Roman harbor walls have been sitting in seawater for two millennia and are somehow fine. Every few years, another study comes out ...

Roman concrete's durability comes from a combination of its ingredients and production methods. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.