According to Wired Magazine, "Brasília was almost entirely built in 41 months, at great expense, and opened in April 1960. It was intended to be a more central, neutrally located capital for the country whose previous capital, Rio de Janeiro, sits on the southeastern coast in the midst of much of the country's commercial activity. Today, Brasilia's greater metropolitan area is home to nearly 4 million people. It is one of the largest cities in the world that was built since 1900."
To see more strange and beautiful images of planned cities, visit Wired Magazine's article here