8. The Sumerians - Fall of the First Cities

2. The Bronze Age Collapse - Mediterranean Apocalypse

3. The Mayan Collapse - Ruins Among the Trees

1. Roman Britain - The Work of Giants Crumbled

7. The Songhai Empire - Africa's Age of Gold

11. Byzantium - Last of the Romans

12. The Inca - Cities in the Cloud (Part 1 of 2)

8. The Sumerians - Fall of the First Cities

13. The Assyrians - Empire of Iron

6. Easter Island - Where Giants Walked

3. The Mayans - Ruins Among the Trees

2. The Bronze Age Collapse - Mediterranean Apocalypse

1. Roman Britain - The Work of Giants Crumbled

11. Byzantium - Last of the Romans (Part 2 of 2)

12. The Inca - Cities in the Cloud (Part 2 of 2)

13. The Assyrians - Empire of Iron

12. The Inca - Cities in the Cloud

9. The Aztecs - A Clash of Worlds (Part 1 of 2)

11. Byzantium - Last of the Romans (Part 1 of 2)