(CNN) -- Do you know what sailing destination is pictured above? Take part in our mystery photo challenge.
How it works: We provide three hints about the location and then you share your guess in the comments section below. We'll reveal the answer in a week.
Hint 1: It is one of Europe's most historical ports.
Hint 2: It is partially encased within a two kilometer stone wall.
Hint 3: It is nicknamed the "Pearl of the Adriatic."
Good luck!
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