I'm heading to Europe in 7 days, due to how easy it is to fly from one country to another and how cheap it is (seriously Manchester to Ibiza was $30 usd). You can if you pace out your budget, and have a great travel backpack (osprey 40 is at the top for a reason) can get away with a lot. My current trip is Ibiza to Amsterdam to Dublin and then back. Sites like https://www.wanderu.com/en/home can help you plan more bang for your buck. Personally I think backpacking at least 2 countries is the best option.