The Romans The Romans The Roman Empire The Roman Republic The Imperial Age The Roman Army A Roman Fort Towns Building Technology Roads and Travel Farming and the Countryside Trade and Ships The Town House Family Life Food and Drink The Public Baths Entertainment Religion The Late Roman Empire The End of the Roman Empire	Roman Wall Two low brick or stone walls were built with a space in between. Then the space was filled with concrete. Another layer could be built on top after the concrete had dried.   Previous: Back Book: The Romans Section: The Romans Chapter: Building Technology