Cataratas International Airport — Foz do Iguaçu, Brazil

IGU exists almost entirely because of a natural spectacle next door: the Iguazu Falls, a sprawling system of hundreds of individual cascades straddling the border between Brazil and Argentina. Located a short drive from downtown Foz do Iguaçu, the airport channels a steady stream of vacationers, honeymooners, and tour groups heading to national parks on both sides of the frontier, as well as to the massive Itaipu hydroelectric dam nearby, among the largest power plants on earth by generating capacity. Because the city sits at the meeting point of Brazil, Argentina, and Paraguay, IGU also serves cross-border shoppers and business travelers using Foz do Iguaçu as a base for the tri-border area. Domestic carriers connect the airport primarily to São Paulo and Rio de Janeiro, with seasonal charter flights supplementing scheduled service during peak tourist months.