Dettifoss is one of Europe's most powerful waterfalls, located in Vatnajökull National Park in northeast Iceland. It's a real powerhouse, making the ground shake under your feet and creating a thunderous roar as the water cascades over the edge. During the summer months, it's a must-see for its awe-inspiring display of nature's force. Just be prepared to get a little wet from the spray if you visit the west side viewpoint!