Poznan isn't so beautiful anymore. How come there have been no progress for the last 5 centuries? smile
? - I have no idea what do you mean. The city is courently more than 20 times bigger compared to its size during the XIV-XVI century.
When it comes to the old town - in most part it is being restored to its former look.
i.e. right now - beside what you see there are courently c.a. 50 historic houses undergoing renovation in the old town area and there are also plans to reconstruct the old castle - as well as perhaps in the future - the defensive walls.
What makes the beauty of Poznan is also the new post-industrial architecture introduced by the Kulczyk family:
galeria.cyfrowe.pl/p/7/8/12256.jpg
as you know or perhaps not this is only the first phase of what Mrs. Kulczyk is building in that city.