I was in Japan for a student exchange in 2016/17 and the amount of detail I remember from that time is astonishing. I can barely remember how I spent my day yesterday (in general I feel like I don't have a very good memory), but I can easily list all the trips we've taken during that semester and remember details that I would usually forget.
In general, I feel like most of my memories are structured around my unique (mostly travel-related) experiences. Oh 2015, that was the first time I ever left continental Europe and flew to Iceland in the middle of the semester to visit my friend. Things like that.