Gwen tells us more about the development of technology in Nazi Germany.
Explore More Video: Web Exclusives
- Behind the Scenes - Series Three Go behind the scenes into History Detectives HQ.
- Civil War Balloon In this clip from Season 3, we find Wes up in the air in a hot air balloon!
- New York Public Library Find out more about the New York Public Library.
- Re-Enactors More on the armies of re-enactors who help recreate history.
- History of Writing Gwen tells us about the history of the written word.
- Civil War Photography Get background on the development of photography during the Civil War.