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How did builders create the terrace walls at Persepolis?
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Persepolis
Ruins of the royal Achaemenid residence at Persepolis, Iran.
The terrace walls at Persepolis were constructed as retaining walls that varied in height from 13 to 41 feet (4 to 12 meters), depending on the slope of the ground.12
These walls were built using dark gray stone sourced from the adjacent mountain. The builders cut this stone with extreme precision into large blocks, which were then laid without the use of mortar. Many of these massive, precisely fitted stone blocks remain in their original positions today.12