All international air travel, some cruises, and cruise lines requires a passport. When travelling internationally many countries require an expiration date six months after the return date. Click here to Apply for or Renew a Passport(https://travel.state.gov/content/travel/en/passports.html)
Some countries require a VISA. You may click here (https://travel.state.gov/content/travel/en/international-travel/International-Travel-Country-Information-Pages.html)for more information on country entry requirements.
