Italy, France, and Spain are all pretty great destinations, and it'd be easy to spend all your time in the western countries. But don't miss out on heading farther east. Countries like Poland, Bulgaria, Albania, and Czechia (to name a few) are all incredible. Plus they're usually a lot cheaper and not as busy as the trendy western cities. During the summertime, I could get by on $30 a day in the Balkan countries, while if I was in Italy, a hostel bed alone was $40.