Photo challenge: Where is this port?

Part of complete coverage on

Ready for a challenge? Take part in our mystery photo game.

STORY HIGHLIGHTS

• Can you identify this sailing destination?
• Submit your guess in the comments section below
• Check the MainSail page, where we'll reveal the answer in a week

(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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