Eldest son William just completed his 17-month World Tour.
After graduating from college, he took a job teaching English in China for a year. Apparently, they offered him a hefty raise and promotion if he signed on for another year, but his main goal was to see as much of the world as he could before coming home.
So, after he had fulfilled his year-long obligation, he spent an additional five months touring the world, including Thailand, Nepal, India, Chile, and Argentina, before capping it all off with a week-long cruise to Antarctica. Which means that this 23-year old has now visited all seven continents.
And if this isn't crazy enough, check what he does at 2:35!