The Bayeux Tapestry, Normandy, France
The Bayeux Tapestry was the medieval equivalent of a newspaper, or at least a speech by a politician. It tells the story in pictures and words of the rationale and the history behind the Norman Conquest of England. In fact, William the Conquerer, the Norman duke who defeated the English King Harold at the Battle of Hastings and assumed the throne of England, had the thing done only a couple of years later so he could explain to everyone his side of what happened and how a French guy ended up as King of England.