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A land fortification, built in the second half of the 18th century. 18, with a project by the engineer Schaumbourg-Lippe, better known as Count de Lippe, and works led by Étienne and then by António de Valleré, which introduced several significant changes, constituting the eighteenth most important strongman of the country and with unique characteristics in the world, "a fortification masterpiece whose art has completely exhausted itself here," according to Christian, Prince of Waldeck, in 1798.