I've been dying for years to get an Interrail global pass and just travel around Europe by train for a month. Just take my time and visit as many places as possible. I love travelling by train, it's such a chill experience to take your time and enjoy places in my opinion. But yeah, another thing that will have to wait with the whole covid-19 situation. Plus money I don't have right now.
But it's definitely one thing I still dream of doing someday.