Learning a new language.
Learning a new language can be quite the challenge for some people. But think about it this way, everytime you learn a new language you can add another millions of people to who you can get to know and have a conversation with. Learning a language can help you adapt to new places and also help you appreciate a new culture without the language barriers. With a new language you can learn how to read, write and speak fluently. I say, that's pretty darn impressive.