Fall in love all over again beside Iguazu Falls, a crashing confluence of cascades tumbling over a plateau bordering Argentina and Brazil. Feel your hearts pound in unison while rock climbing in Patagonia’s Los Glaciares National Park or hiking Tierra del Fuego’s Glaciar Martial. Drink a toast to a fine romance in a Mendoza vineyard, or lose your head in the clouds aboard the Tren a las Nubes, a railway traversing magnificent peaks and canyons.