What was the Gate of Xerxes at Persepolis?

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The Gate of Xerxes, also known as the Gate of All Nations, served as the main entrance to the terrace at Persepolis, the ancient capital of the Achaemenid Empire.12

This structure is characterized by its use of colossal guardian figures, specifically bulls and bull-men, which flank the entrance. Architecturally, the gate features a square plan that stands as an independent unit on the terrace. While much of the original structure has been lost, its entrance hall still retains two standing columns, with a third having been reassembled from its original fragments.213