Thank you for comment!

In European Union borders between the countries practically doesn't exist, so it was easy to travel from Poland to Lithuania. If I would like to go, let's say, to Belarusia, it would be much more challenging. I'd need permissions, visas, I'd have to pay and I'd have limited time when I could stay there.

Yes, it's a privilege to be born in Europe. It shouldn't be - the world should not be so diversified in access to some goods and rights - traveling should never cause stress and should never be challenging, not to mention more serious differences. Not much can be done to change it though, at least not by us...