This is always something I have fancied doing as a cheaper alternative to a round the world trip. I think although we have many countries literally on our doorstep, there are so many cultures out there waiting to be explored and many accessible at a relatively small cost.
With a 5 day pass spread over 10 days travel, which allows for stopovers, starting from around the £200 mark, this means you can be in a position to travel through a number of countries and see different things that maybe you have only thought about before.
Maybe it is something as simple as the Eiffel Tower in Paris, or maybe you fancy visiting the flat landscape of Holland. All of these can be covered and with the opportunity to extend the pass should you need to, a longer trip with more destinations is well within your grasp.