A friend sent me the following puzzle and claimed that with a bit of general knowledge (or compensatory research skills) and creative thinking I could arrive to the answer. Alas, the puzzle exceeds my abilities and I need somebody to crack it - not just anybody - a puzzler from here.
N.B. The puzzle is (hopefully) original, and attributed to me; the "friend" is a fictional character.
One of the Seven Wonders of the Ancient World may guide you to the right direction in solving this puzzle.