Altamira, Brazil

This sprawling municipality in northern Brazil is not for the faint of heart. Altamira covers an area larger than 104 countries, with a population density of just 0.73 inhabitants per square kilometer. The municipal GDP sits around $450 million, driven mainly by agriculture, trade, and construction of the massive Belo Monte Dam. However, the climate is tropical and wet, with an average annual rainfall of 73 inches. Bureaucracy is a persistent headache, as the city was only recently elevated from a Jesuit mission to an administrative center. Overall, Altamira is best suited for hardy pioneers and outdoor enthusiasts willing to brave the Amazon's humidity and isolation.