Favorite thing: Hamburg's Michaeliskirche is surprisingly pretty for the north of Germany, which is not so known for beautiful churches. It is without a doubt Hamburg's most famous church, to be found close to the city center and the harbour.
This is the main church of Hamburg called St. Michaelis. People from Hamburg call it the 'Michel'. It's a very beautiful church and every day a man plays plurally chorals on a trumpet from the spire.
This church is not a must, but it is an old emblem of Hamburg.