Unruly tourists challenge bans and wash their feet in the Black Tiger Spring in Jinan city, capital of East China’s Shandong province, July 26, 2015. Winds emit a terrifying roar as they blow through the cave where the water flows out, which is why the spring has been given its name of Heihu, or Black Tiger. The spring water is so pure that many local residents carry it home to drink. (Photo/CFP)
