Is it the ancient city of Persepolis?
Zhelong was the first one to mention the correct answer. Thank you for your efforts.
The place is Persepolis, the capital of the Achaemenid Empire (ca. 550-330 BCE). http://en.wikipedia.org/wiki/Persepolis
This gate is the "gate of all nations". The palace belongs to Cyrus the Great.
Zhelong, it's your turn.
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