I love Oscar Niemeyer work. As a brazilian, our archtecture was heavily influenced by him. Here are some of his projects I like:
Brazilian National Congress, Brasilia, Brazil:
Cathedral of Brasilia, Brasilia:
Administrative town, Minas Gerais state administrative building, Belo Horizonte, Brazil:
Oscar Niemeyer Museum, Curitiba, Brazil:
Museum of Contemporary Art, Brazil:
Oscar Niemeyer International Cultural Centre, Avilés, Asturias, Spain:
Communist Party Headquarters, Paris, France:
There are other buildings designed by him...