Jiuzhaigou Valley, Sichuan, China

In the north of Sichuan province, the Jiuzhaigou Valley is a national park, nature reserve, and UNESCO World Heritage Site. In addition to several crystal-clear lakes, it's a region of multi-tiered waterfalls and snowy mountains. Tourism arrived late but is growing strong, and while swimming isn't allowed...there's always nighttime skinny dipping (Photo Credit: Who is taking pictures?).