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It's in an area of difficult access (only by plane or boat), and was built in 1775 to defend the Brazilian territory against Spanish invasions. It was also scene of battles at the time of the Paraguay War. Protected by National Historic Landmark in 1975.
The Christ
Similar in shape to the one in Rio de Janeiro, it sits on a hill with a nice view of town. From the city bus terminal, it's possible to catch a bus passing near to the steps that lead to the top.