My boys are 15 and 17. It will probably be the last holiday we have together. But they both want a very different type of holiday that we've never had before. They want to visit different countries in Europe. They are both interested in history particularly military history. My 15 year old also loves visiting castles and interestingcities(and loves star wars lol!!) and my 17 year old loves mountains and activities. I don't know where to start or what to do. I feel clueless! Please 🙏 help!