(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.