A large cannon fires into the town square of the Basque town of Guernica, scattering small children. Fortunately, in a place tragically famous as Hitler's testing ground for the bombing of civilian targets, this is just part of the entertainment at the summer fiestas. The shiny weapon shoots watery bubbles at delighted children dressed in swimwear and goggles.

But clues to Guernica's tragic past abound in a market town levelled 75 years ago during an almost non-stop four-hour bombardment in which Luftwaffe units...Click HERE to keep reading