Stunning visit to Muro das Nove Janelas (Nine Windows Wall) which is part of an old stone aqueduct Aqueduto do Carvão (Coal Aqueduct) located close to Mata do Canário (Canary Forest). This aqueduct was built in the 17th-18th centuries in order to supply water from several lakes of the Sete Cidades area to the city of Ponta Delgada
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