Ticinus in Poul Anderson's Guardians Of Time before I read about them in Latin at school. Think about how many historical periods are covered in Anderson's works.
Similarly, a screen adaptation can be a good introduction to a novel. I can quote two good examples of that but neither of them comes from Poul Anderson because his works have not been filmed as yet.
I can no longer read Anderson for relaxation because I am continually seeking blogging material and this is mental work; entirely self-motivated but work nevertheless. Being tired from a late night and a busy day, I do not want to tackle Chapter 17 of Operation Luna as yet, although page viewers are welcome to read ahead and comment with spoilers. For relaxation before turning in, I instead reread The Girl With the Dragon Tattoo by Stieg Larsson, another endlessly fascinating work. See here.
Similarities to and differences from Poul Anderson. All the better.