What would be a good career for someone who want to "travel the world"?

well im 16 so i have a lot of time to decide what i want but i have never been out of the country and i think when i graduate from college i wanna go see other countrys i think i want to train to be a nurse or something and then join the peace corp. But i know i want to be in the medical field. I dont wanna travel the world forever i eventually wanna settle down. i just dont really know what i want