The ancient capital of the Persian Empire was Persepolis, located in modern-day Iran. Founded by Darius I in 518 BCE, it served not only as a ceremonial capital but also as a key site for the administrative and cultural activities of the empire. Persepolis is notable for its monumental architecture and intricate relief sculptures that depict the subjects of the empire bringing tribute. It symbolizes the power and sophistication of the Achaemenid Empire and reflects Persia's diverse cultures. The site has remained a critical archaeological location, offering invaluable insights into ancient Persian history and governance.