The people of Hiroshima gathered on Tuesday to mark the 57th anniversary of the dropping of the atomic bomb. The bomb killed 140,000 Japanese civilians, and turned the city into a blackened wasteland. Pictures of that wasteland show just a single building left standing, the famous "A-Bomb Dome", now the centrepiece of Hiroshima's Peace Park. But less well known is that one of the world's most famous buildings was the work of a Czech architect, who spent much of his life in Japan. Rob Cameron has more.