Who invented the alphabet? Is the lost city of Atlantis a legend? Was there really a Trojan horse? Challenge students to explore several important unexplained events that helped shape history. Students use primary source materials, posters, and simulations to find clues and to make informed decisions about these events. There are no " right" or " wrong" answers. These real-life mysteries encourage students to research, think, debate, and form conclusions. The activities target standards in these areas: relationships and patterns in history, historical perspective, map skills, development of civilizations, and presentation skills.