Likely, sometimes, you are thinking about driving through Europe by car, or train. Plenty of another countries you will passing by, getting to know the habits, architecture. You will be able to have as many stops as you like, and stay in particular cities even for whole day. There is even an option to get one ticket for every European Trains
, expired after two weeks. This is very tempting option, and not as unreasonable as you can think it is. You might get a train ticket in Wroclaw and, after few days, wake up in Madrid, for example. So stop hesitate, collect your baggage and head to the closest railway station!