History Detectives - The Case of the Persian Puzzle

Holidays will never be the same again! 

Picture
Persepolis, built around 520BC.
Traveling through Iran, you have come across majestic ruins - it is the hauntingly beautiful city of Persepolis.

Who were the people who built such a magnificent city?

 And what happened to this once mighty civilisation?

Your task is to investigate the case of the Persian Puzzle, and to produce an illustrated book, covering seven topics, so that the world will know about this fascinating and lost society.

Picture
Persepolis, one of the four capitals of the sprawling Persian Empire.