A section of the Roman city-wall of Empuries, Spain. 1st century BCE. The base of the wall was made using calcareous rock while the upper portion is of Roman concrete (opus caementicium).
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APA Style
Cartwright, M. (2016, August 29). City Wall of Stone & Opus Caementicium, Roman Empuries (Detail). World History Encyclopedia. https://www.worldhistory.org/image/5548/city-wall-of-stone--opus-caementicium-roman-empuri/
Chicago Style
Cartwright, Mark. "City Wall of Stone & Opus Caementicium, Roman Empuries (Detail)." World History Encyclopedia, August 29, 2016. https://www.worldhistory.org/image/5548/city-wall-of-stone--opus-caementicium-roman-empuri/.
MLA Style
Cartwright, Mark. "City Wall of Stone & Opus Caementicium, Roman Empuries (Detail)." World History Encyclopedia, 29 Aug 2016, https://www.worldhistory.org/image/5548/city-wall-of-stone--opus-caementicium-roman-empuri/.