Plitvice Lakes National Park

Triple America's five Great Lakes, shrink them each to manageable size (i.e., 536 acres in all), give them a good cleaning until they look virtually blue, envelop them in lush green forest with steep hillsides and cliffs all around, and link not just two but all of them with a pint-size Niagara Falls. The result? Nacionalni park Plitvi?ka jezera, a UNESCO World Heritage Site and Croatia's top inland natural wonder.