Kadse1337

The question is not European Union or not, it's Schengen Area or not. Schengen is a contractual area made of 26 EU and non-EU countries that have abolished regular border controls between their countries. You normally only get checked more thoroughly once; when entering the Schengen area. All central-, northern- and western-European countries are part of the Schengen Area (besides UK & Ireland). But yeah, the Balkan states below Hungary/Slovenia are not (yet) part of Schengen except Greece. When visiting Croatia (not in the Schengen Area) we had to get out of the Flixbus at the Slovenian/Croatian border and show our passports to the border guard.

What's also great is that you don't even have to drive yourself. You can go pretty much everywhere in Europe with trains and busses, and not even be stopped for more than a few minutes when passing borders (unless it's a Schengen border). Makes everything even easier and leaves more time for geocaching & sightseeing

This summer was crazy, over the course of 3.5 months I interrailed through almost half of Europe (with pauses in between) and visited 20 countries, from which 17 I never cached in before. There were a lot of awesome caches on the way! In chronological order: Switzerland, France, Belgium, Luxembourg, Netherlands, Germany, Denmark, Sweden, Finland, Estonia, Latvia, Poland, Liechtenstein, Italy, Vatican State, Slovenia, Slovakia, Hungary, Croatia. Now the only big area I'm still missing in Europe are the Balkan states, sadly train service there isn't that great.