The ruins of the holy city of the Kingdom of Elam, surrounded by three huge concentric walls, are found at Chogha Zanbil, also spelled Tchogha Zanbil, according to UNESCO. “Founded c. 1250 B.C., the city remained unfinished after it was invaded by Ashurbanipal, as shown by the thousands of unused bricks left at the site.” This is the largest ziggurat outside of Mesopotamia and the best preserved of this type of stepped pyramidal monument. Chogha Zanbil became the first Iranian site ever on the UNESCO World Heritage List in 1979.