The Revealer Clue #1: A common find reveals an uncommon history

This picture holds tiny clues to the truth about a technological feat from ancient times, which may have been wrongly attributed to an invading army.

This week's installment of "The Revealer" will change what you know about history. But can you guess where and when this story takes place?

Leave your answer here in our comments section.  We’ll announce the name of the first person to figure it out, when we debut this all-new installment of "The Revealer" Thursday on BackStory.