Hi Eva!
That's a lot of countries you want to visit. You'd better start making a list! I think inter-rail is a great idea - it's one of the best ways to get around Europe and see lots of different places. I remember when I was a student that some friends of mine went inter-railing and had lots of adventures. I remember they were marched off the train by armed guards at the border of one of the former communist countries as thet didn't have a visa - everyone must have thought they were spies!
When will you go? Next Summer?
