Sé Catedral do Huambo is the city's main Catholic landmark, a white-and-blue church north of the civic centre. Its value is not in ornate detail but in the way it marks Huambo as a provincial capital with a strong religious and administrative role.
Visit it as part of a walk through Cidade Alta and Cidade Baixa. The cathedral helps give shape to the city centre, especially if you are trying to read Huambo beyond its war damage.