Seljalandsfoss is one of Iceland's most famous and enchanting waterfalls, located on the Seljalandsá river. Its true magic lies in the unique path that allows visitors to walk completely behind the 60-meter (200-foot) cascade. The water plunges over a former sea cliff, which now marks the boundary between the coastal lowlands and the highlands. Standing in the cavern behind the falls offers a surreal, 360-degree perspective, where the roar of the water is amplified and the world is viewed through a shimmering, liquid curtain. Be prepared to get wet from the heavy spray, but the breathtaking views and photographic opportunities make it well worth it.