Want to witness falls so grand that they make Niagara look modest? Let's explore Iguazu Falls, the largest waterfall system in the world. The name 'Iguazu' comes from words in the regional languages Guarani or Tupi, which mean 'big water.' These series of waterfalls are formed by the Iguazu River, on the border between Argentina's Misiones province and Brazil's Paraná state. They feature a striking staircase formation, with a two-step cascade created by three layers of basalt.

Before these falls became the spot we know today, they had quite a journey. Spanish explorer Alvar Núñez Cabeza de Vaca might have been the first European to see the falls. In 1907, businessman Domingo Ayarragaray saw the potential of this area and built a hotel and roads. The falls became such a sensation that they were designated as national parks in both countries—Argentina's Iguazu National Park in 1934 and Brazil's Iguaçu National Park in 1939. UNESCO designated these national parks World Heritage Sites in 1984 and 1986, respectively, and they were later granted Outstanding Universal Value status.