If you spend your time in continental Europe does not forget to make your trip planning. Europe is a large continent with many countries as well. Each state has its own privileges. Never pass special places in every country when you have been up to this continent. It does not matter even if you are traveling alone.
The train is one means to connect to several countries ranging from London, Italy, France, Germany, Denmark, etc. with ease. If you take a trip to several countries with a planned then you will get a discount.
You can also learn these first before you go to start. Tickets you can order once completed the route you will travel.
This is one example of using the train evens a landline such as bus, car, or by plane.