My wife and I are planning a long road trip in September from The Netherlands to Vilnius in Lithuania. We are going to visit a friend there and then drive back again.
We are planning for around 2-3 weeks. We would like to stop over in Berlin and Warsaw on the way to Vilnius. And then on the way back we are flexible. We would like to take a different route back to The Netherlands.
Are there any hidden gems or tips you can provide for such a trip?