The Free University of the Environment is one of the most beautiful places in the city of Curitiba. Opened in 1992, it is surrounded by a large forest, and operates a quarry. To reach the university, you'll need to walk for about 5 minutes; the road is beautiful. It was built with the intention of being a benchmark in the study of environmental conservation and sustainability. As such, it has an ampitheatre, a lake, and a wooden tower which you can climb and enjoy really wonderful views. Admission and parking is free.