Yeah, didn't know the route.
There is not much to see on your route in Germany, you could take a look at Bad Muskau (south from the border cross), there is a popular Polish marketplace where Poles, Czechs etc. sell many things to Germans. But I don't know if it's interesting, never been there.
Beside that, you could visit Legnica or Wroclaw, both have some nice stuff to see, but Wroclaw is bigger.
Gliwice is also a more or less big city, but I never heard anything interesting about it.