Ka'ba-ye Zartosht (cube shaped construction in the foreground) against the backdrop of Naqsh-e Rustam.

The Ka'ba-ye Zartosht (alt: Kaba-ye Zardusht, Kaba-ye Zardosht , Persian: ???? ?????), meaning the "Cube of Zoroaster," is a 5th century B.C.E. Achaemenid-era tower-like construction at Naqsh-e Rustam, an archaeological site just northwest of Persepolis, Iran. This enigmatic structure is one of many surviving examples of the achaemenid architectural design.