Here’s some great videos on this question from YouTuber ToldinStone - Garret Ryan Author of Naked Statues, Fat Gladiators and War Elephants Why was Roman conc

Here’s some great videos on this question from YouTuber ToldinStone - Garret Ryan Author of Naked Statues, Fat Gladiators and War Elephants Why was Roman concrete forgotten during the Middle Ages? https://youtu.be/dbvvlFHCNn4 https://youtu.be/dbvvlFHCNn4 See also his YouTube series: History of Rome in 15 Buildings The Colosseum: https://youtu.be/m6iHR8zqbiM https://youtu.be/m6iHR8zqbiM