Yosemite and Yellowstone National Parks might be beautiful, but they are not the only stunning parks this planet has to offer. The world is full of stunning nationally protected parks spanning vast African savannahs, European mountain ranges, South American rainforests and beautiful beaches - and all of these destinations areextremely popular with tourists. In fact, according to a new study published inPLOS Biology, the world's national parks and nature reserves receive around eight billion visits every year. "It's fantastic that...