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The Fort of Nossa Senhora da Graça, officially called Fort Conde de Lippe, in Alentejo, is located in the parish of Alcáçova, about a kilometer north of the city of Elvas, municipality of the same name, district of Portalegre, in Portugal .
In a dominant position over the so-called Monte da Graça, it was part of the defense of the Elvas and Cidade Fort Square - Elvas Border Barracks and its Fortifications - classified since June 30, 2012 as a World Heritage Site by UNESCO
The site, extensively fortified from the 17th to 19th centuries, represents the largest bulwarked dry-ditch system in the world. Within its walls, the town contains barracks and other military buildings as well as churches and monasteries. While Elvas contains remains dating back to the 10th century ad, its fortification began when Portugal regained independence in 1640. The fortifications designed by Dutch Jesuit padre Cosmander represent the best surviving example of the Dutch school of fortifications anywhere. The site also contains the Amoreira aqueduct, built to enable the stronghold to withstand lengthy sieges.UNESCO
