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Four tombs belonging to Achaemenid kings are carved out of the rock face at a considerable height above the ground.
The tombs are known locally as the 'Persian crosses', after the shape of the facades of the tombs. The entrance to each tomb is at the center of each cross, which opens onto to a small chamber, where the king lay in a sarcophagus. The horizontal beam of each of the tomb's facades is believed to be a replica of the entrance of the palace at Persepolis.
The Ka'ba-ye Zartosht, meaning the "Cube of Zoroaster," is a 5th century B.C.E. Achaemenid-era tower-like construction at Naqsh-e Rustam. This enigmatic structure is one of many surviving examples of the Achaemenid architectural design.
The name Ka'ba-ye Zartosht probably dates to the 14th century, when many pre-Islamic sites were identified with figures and events of the Qur'ān or the Shāhnāme. The structure is not actually a Zoroastrian shrine, nor are there reports of it ever having been a pilgrimage site.
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