Auriga - it goes without saying that AurigaCat is extremely cute too. 
I went InterRailing! Twice.
First time with three friends - Paris, Geneva, Genoa, Florence, Rome, Naples, Venice, Vienna (where I lost my passport), Munich, Strasbourg, Paris and home.
Second time on my own - Paris, Munich, Salzburg, Budapest, Ljubljana, Sarajevo, Dubrovnik, Skopje, Thessaloniki, Alexandroupolis (where I ran out of money and slept in a hotel kitchen), Istanbul, flew home.
I can't even contemplate how DM let me go by myself, but in fact you're never alone on the Youth Hostel circuit; in fact, I bumped into the same two Aussie blokes three times during the course of my travels.