I was also reminded of the Romans as related on the History Channel show "Engineering an Empire". They talked a lot about how the Romans used concrete for vario

I was also reminded of the Romans as related on the History Channel show "Engineering an Empire". They talked a lot about how the Romans used concrete for various purposes including aqueducts, etc. Iirc, they mentioned that they'd built a building with a vaulted concrete dome that we weren't able to reproduce, even after the re-discovery of cement, until we had computers.