Đerdap National Park deserves to be high on most traveler’s lists. This immense national park follows the Danube River through the Đerdap Gorge, also known as the impressive Iron Gate. For almost 100km, this gorge carves its way across Europe, providing the border between Serbia and Romania. At times, the steep cliffs that line the gorge are as high as 500m from the river, creating quite an imposing atmosphere. The terrain around the national park varies from mountains to ravine and lakes, that means you don’t need to go far to find an excellent panoramic viewpoint.