
11 countries, 31 days, 1 continent
Interrail
Video: https://www.youtube.com/watch?v=_-Dz_smLC30
For an Eurotour an InterRail ticket could be just what you need, because with this ticket, you can travel freely on Europe's trains for up to a month.
Buying Your Ticket
The InterRail ticket works on a 'price level' system. Each country in Europe is priced at one of four levels depending largely on how much it costs to travel in that country. With 'Level 1' as the most expensive, they are priced like so:
Price Level 1 - France, Germany, Great Britain, Norway, Sweden
Price Level 2 - Austria, Belgium, the Netherlands, Luxembourg, Finland, "Greece Plus" (incl. ferry Greece - Italy), Republic of Ireland, Italy, Spain, Switzerland
Price Level 3 - Croatia, Denmark, Greece, Hungary, Poland, Portugal, Romania
Price Level 4 - Bulgaria, Czech Republic, FYR Macedonia, Serbia, Slovakia, Slovenia, Turkey
You can either buy a pass for a single country or purchase a 'global pass' that covers all of the above countries.

Read more: https://www.interrailnet.com/