Likely, sometimes, you are thinking about cruising through Old Continent by car, or railway. Many of different countries you will crossing by, getting to know the culture, architecture. You will be able to take 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 really interesting method, and not as unreal as you can think it is. You can get a railway ticket in Wroclaw and, after couple days, wake up in Madrid, for example. So stop hesitate, get your baggage and go to the closest railway station!