Baring it all in your birthday suit outdoors is surprisingly trendy online – there are wildly popular Instagram accounts solely dedicated to posing nude using stunning outdoor locations for a unique photo op. Recently trending: (illegal) nude selfies at Machu Picchu. Is this a new craze at Arizona’s parks? “We aren’t really aware of it,” says a National Park Service representative at the Grand Canyon, adding that if people are posing for these types of...