Created on a landfill that extends into Guanabara Bay, the long serpentine park remains one of Rio's prime green spaces, and is sprinkled with football fields, grassy lawns, tree-lined paths, outdoor concert halls, monuments, museums and several scenic beaches (which are fine for strolling along, but not clean enough for swimming). Brazilian landscape architect Roberto Burle Marx, best known for his contributions to Brasília, designed the 296-acre park. One of the best times to visit is on Sundays, when the avenues through the park close to traffic, and cyclists, joggers and inline skaters rule the roads.