First stop on Thursday 16 was Cologne Cathedral. It is said to be the largest Cathedral in Europe. It is very imposing and can be seen virtually all over Cologne. Building began in the year 1200 and it still goes on, having needed extensive recovery after the war. It is constantly being cleaned by a team of 200 workers. Our photos will show some of the very fine work, and also the reason for the constant cleaning. Cologne is apparently a very polluted city – and that was evident by the smog as we drove in.