Why was Roman Concrete Forgotten during the Middle Ages?

During late antiquity, concrete all but vanished from the Mediterranean world, and would not be used widely again until the twentieth century. This video explains why. Head to https://squarespace.com/toldinstone, and save 10% off your first purchase of a website or domain with the code TOLDINSTONE. Please consider supporting this channel on Patreon:   / toldinstone   If you liked this video, you might also enjoy my book “Naked Statues, Fat Gladiators, and War Elephants: Frequently Asked Questions about the Ancient Greeks and Romans.” https://www.amazon.com/Naked-Statues-... If you're so inclined, you can follow me elsewhere on the web:   / toldinstone     / toldinstone     / 20993845.garrett_ryan   Chapters: 0:00 Introduction 0:39 Understanding Roman concrete 1:29 Early experiments 2:25 The apogee 3:33 Squarespace! 4:19 Geographic limits of Roman concrete 5:00 The decline of concrete 6:28 Final notices 7:26 Not forgotten, but gone Thanks for watching!