I've done several euro road trip, last one was to the Monza GP, round about and back, before that was Estonia and back.
Best advice I can give is don't be too ambitious with how far to go in one day, break the journey up into smaller sections and take your time, the journey is often better than the destination
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2019 BMW M5 (my daily driver)
2002 Mark's D2 S8 FE
2020 BMW M340d xDrive (Anely's daily driver)
2000 FL D2 4.2 QS - SOLD 2011