What's a riveting read for travel through central and eastern Europe?

Looking for book suggestions for my travels next week—related to the land/people I’ll be in, of course, at least in some way—author, or subject matter or… I will start in Vienna and head east, likely to Hungary and Slovakia, maybe Romania or Ukraine, definitely Poland and Germany and Denmark.

I’m both fiction and non-fiction, as well as magazine journalism and essays…

Thanks, Flutherbrains.