When the Ostrogoths besieged Rome in 537 AD, their first military act was to cut the aqueducts. Eleven gravity-fed channels supplied the city with up to a million cubic meters of water per day, more ...
Sede Regional da Companhia Hidrelétrica do São Francisco (Chesf), Salvador, Bahia, 1976. Imagem © Gabriel Fernandes via Flickr, sob licença CC BY-SA 2.0. Ampliada ...
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