Antiquity Riddles

While you were idly turning over the pages of "The History of the Ancient World" encyclopedia, a little sheet of paper slipped out of it. It turned out to be a treasure map, and you departed immediately. But when you were standing on the place which in the map was marked with a thick red cross, you saw a big rock in front of you with some signs scratched on it. It's just a riddle you are to solve to reach the treasure!