La Casa de Fierro is one of the finest as well as best-preserved samples of civil architecture in Peru. The walls, ceiling, and balcony are plastered in rectangular sheets of iron. It is said to be the first prefabricated house in the Americas. Although popularly said to have been designed by the French architect Gustave Eiffel, there is no evidence at all that this is true; the building does not reflect his architectural style. Since 2011 well substantiated claims prove it was built in the Belgian workshops of Les Forges d'Aiseau (Joseph Danly process). Rubber baron Anselmo del Aguila bought it at the International Exposition of Paris in 1889. Once dismantled, it was brought in pieces to Iquitos (the metal sheets were carried by hundreds of men through the jungle), and assembled there in 1890.