But these aren’t the only places across the pond where you’ll need more than just a passport: Anyone looking to visit other European countries, including Belgium, Denmark, France, Germany, Greece, Iceland, and Italy, will need to apply for an application through the European Travel Information and Authorization System (ETIAS).

Beginning this month, anyone from the United States, Canada and Australia must apply for permission to enter these countries and territories: What you should know.

American's without a passport can still travel to these tropical (and international) destinations. The U.S. is the fourth largest country by land mass, with over 3.5 million square miles to explore. It’s home to 63 national parks and some of the most well-loved cities in the world.

Planning your dream vacation requires more than just picking a destination. Start by reviewing your passport months ahead, as advised by the State Department, to allow ample time for renewal if needed.