Mozambique, Maputo. The Casa de Ferro, or iron house, on the Avenida Samora Machel in the Baixa district of Maputo. It is a construction of prefabricated metal parts designed by the French engineer Eiffel. Maputo is the capital of Mozambique. It is a bustling, attractive port city with a population of at least 1.5 million.. Maputo is a very agreeable city which is considerably safe and more attractive when compared to other African capitals.