john, I imagine that you experience some of the same barriers that I face in Turkey. In the US an "old" building is rarely more than 200 years old. In Europe 200 year old buildings are often of the "newer" variety. The task of retro-fitting ancient buildings is always controversial because often changes in the design and/or structure are necessary. In truth, I do not even know how some of the places in Turkey could ever be made accessible to those of us in wheelchairs.
I ultimately just have to conclude that there are some places, like Mt. Everest, that are never going to be experienced by a person in a wheelchair. Since I will never hike into the valleys in Cappadocia I have to be satisfied with the things I can see from the accessible paved walks and from the road.
When we are talking about an entire country, however, it is a different issue. I am sure that it is very difficult to live in a country that cannot yet provide equal access, and yes, I am appreciate of the fact that legislation in the US has made my own country much easier to manage.
In the US the ADA legislation was a long time in coming, and there were many howls of horror as it was implemented. There are still lots of places that are not fully compliant with the law. For some small business owners creating equal access entries, and/or equal access bathroom facilities has been almost prohibitively expensive. The kind of changes that must be made to the basic infrastructure are slow in coming, and they are expensive.
I hope Poland is soon able to accommodate your needs better both for your sake, as well as for those of us who would like to visit.