Fjaðrárgljúfur is a stunning canyon in southeast Iceland, known for its steep walls and winding river. It's about 100 meters deep and 2 kilometers long, with origins dating back to the Ice Age. Visitors can enjoy a waterfall on the western side and a hike along the eastern edge. However, due to the popularity of Justin Bieber's music video featuring the canyon, it was temporarily closed to protect the environment from damage caused by an influx of visitors.