Fjaðrárgljúfur Canyon, located in southeast Iceland, is a stunning natural wonder with steep walls and a winding river flowing through it. Stretching about 2 kilometers long and up to 100 meters deep, this canyon was formed over millions of years by glacier water erosion. Visitors can enjoy a hike to an observation platform to see a waterfall cascading down the western side. However, due to its popularity after appearing in Justin Bieber's music video, authorities had to close it temporarily to protect the environment from damage caused by the influx of tourists.