I think I have something similar to what iabsurdlyexist said, nothing fantastic but a fantasy of a better world. When I was younger I thought it would become real if everyone were good to each other and to themselves, but gradually I stopped believing... in fact, it didn't even happen that gradually but in two phases. First I saw that it's impossible and then, several years later, a shrink I met called it a fantasy world and I finally realized it's just that, but probably necessary one for me when I was growing up.
I still have my better world, it's more enjoyable now that I know it's fantasy and I don't have to try to make it real.