We wandered for an entire afternoon at the Wilanow Palace (Vilanof), which was built for the Polish king Jan Sobieski. Among other things, he was most famous for the victory over the Turks in the 1683 Battle of Vienna. You'll have to look him up because there is way too much for me to type here. It has been enlarged, remodeled and well maintained through the years.
Not bad for a summer home.