I have had a heart for travel since I knew there were other countries outside of the US, and I have since made it a goal of mine to see as much as the world as I possibly can. Sure, in comparison, the Earth is just a little speck of dust in the universe, but compared to me and my even more minute size, it's gigantic.
That being said, one doesn't have to travel to explore. All you have to do is go into your backyard, your local library, to the park down the street... anywhere, really.
You never want to lose that sense of wonder at the world.