(CNN) -- Thanks to everyone who participated in our mystery photo challenge! Nearly all of you guessed correctly. The picture is of Dubrovnik, a port city on the southern tip of Croatia. To recap, these are the clues we provided. 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." Ready to give it another go? Check the MainSail page, where we'll post future mystery photo challenges.
NEW: The photo is of the walled city of Dubrovnik . Dubrovnik is a popular sailing destination on the Adriatic . Check the MainSail page for future photo challenges .