Argentina is a massive South American nation with terrain encompassing Andes Mountains, glacial lakes and Pampas grassland, the traditional grazing ground of its famed beef cattle. The country is famous for tango dance and music. Its big, cosmopolitan capital, Buenos Aires, is cantered on the Plaza de Mayo, lined with stately 19th-century buildings including Casa Rosada, the iconic, balconied presidential palace. Argentina became an independent nation in 1810 seceding from Spain, since then it has had various Juntas and a civil war that lasted from 1810 to 1861 when Bartolomé Mitre secured Buenos Aires predominance and was elected as the first president of the reunified country. He was followed by Domingo Faustino Sarmiento and Nicolás Avellaneda; these three presidencies set up the bases of the modern Argentine State. During the 1930s and up until the end of the WWII Argentina again went through coup and counter coup. This was ended by Juan Domingo Perón, and his popular wife Eva who brought stability and full employment back to the count. Tourism in Argentina is characterized by its cultural offerings and its ample and varied natural assets. The country had 5.57 million visitors in 2013. The country's capital city, Buenos Aires, is the most visited city in South America. There are 30 National Parks of Argentina including many World Heritage Sites in Argentina.