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What was an apadana in Achaemenid architecture?

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Darius the Great — Darius I This chromolithograph of a frieze at Susa depicts attendants serving Darius I.

In Achaemenid architecture, an apadana refers to a grand, columned audience hall found in ancient Persian palaces.12

This architectural design became a hallmark of the Achaemenid style, characterized by a large, square-planned hall featuring corner towers and external colonnades. The most famous examples include the great apadana built by Darius I at Susa and the audience hall at Persepolis, which was also initiated by Darius. These structures were designed to accommodate large numbers of people, with the hall at Persepolis reportedly capable of holding 10,000 individuals.134

The term itself is derived from the Old Persian apadāna, meaning "palace," and reflects the importance of these halls as central spaces for royal audiences and state functions within the imperial capitals.12