Another thing is potentiality. If I want, I can afford to go to any place on Earth (I have to save some money for, say, South Pole, but it is still possible). But I can't go beyond Solar System, ever. Maybe it is my character, but when I hear about something that I "can't" do, I become obsessed by it until I can, or at least I can chart a path to this, even potentially.
And it's not I am not trying. I lived (as a legal resident) in six different countries, and visited around 35 more. I saw dark forests, and volcanoes, and icebergs, and glaciers, and other natural wonders. I am not as proficient as some pro-grade travellers who visited every country on Earth, but I hope to see more.