Exploring Elvas and its lines means being in one of the most important barrack cities in the whole world. Military defences from the past are today historical witnesses to bygone times; they are a delight, in part because of the perfection of their construction and the marvellous preservation of the heritage they represent; and also because of the beauty of the scenery in which they stand. Extremely rich religious heritage developed alongside this military system with many temples being built and records kept; and civilian heritage reach its peak with the construction of the majestic aqueduct.