No list of the most beautiful places in the world would ever be complete without mentioning Plitvice Lakes National Park in Croatia. This mesmerizing park is the largest national park in the country and is most famous for its 16 crystalline lakes that join one another through a series of cascades and waterfalls. You explore the park via 18 kms of wooden pathways and footbridges that snake their way around the edges and across the waterfalls to offer unparalleled views of the area. Clouds of colorful butterflies also keep you company throughout your hike. No wonder that Plitvice Lakes manages to attract as many as 1,200,000 people per year.