Gone are the days when travelers solely relied on traveler's check or cash when traveling beyond the U.S borders. The 21st century brought with it credit cards that are both convenient and useful at home as well as abroad. And Americans couldn't be happier. However, there are a few things you need to know about credit cards. If you travel outside the U.S. – and in destinations where U.S visitors frequent the most, you’ll use your credit card for daily expenses with nary a hitch. You can use a credit...