An enormous wall of dust hits the Shandan Horse Ranch, Shandan County, northwestern China's Gansu Province, in this stunning shot captured on March 5, 2013. A sudden sandstorm struck the Shandan Horse Ranch on Tuesday morning. According to eyewitnesses, large amounts of black dust and sands were captured by strong winds, resembling a wall rolling across the horse farm and turning the bright, sunny skies pitch-black dark. [Chinanews.com]