At more than 260 feet high and almost 9,000 feet across, the iconic crescent-shaped waterfall in the Iguazú National Park proves Mother Nature is a show-off. Condé Nast Traveler Summer brings prime weather for outdoor exploration, but these international national parks drop jaws year-round—no Instagram filters needed.

From the grassy planes of the Serengeti to the Arctic wilderness of Svalbard, these are the parks that are worth traveling the world to see.