Plitvice Lakes National Park in Croatia is the country’s most popular tourist destination. With nearly 1 million visitors every year, Plitvice Falls consists of a series of waterfalls from 16 different lakes. And with roughly 8 unique trails to choose from, you can take your pick of 3km to 18km routes. If you’re after a challenge, head to the Upper Lakes and Veliki Prstavac where you have the option to explore the whole park.