Fodor's Expert Review Castelo de Marvão
You can climb the tower of Marvão's castle and trace the course of the massive Vauban-style stone walls (characterized by concentric lines of trenches and walls, a hallmark of the 17th-century French military engineer Vauban), adorned at intervals with bartizans, to enjoy breathtaking vistas from different angles. Given its strategic position, it's no surprise that Marvão has been a fortified settlement since Roman times or earlier. The present castle was built under Dom Dinis in the late 13th century and modified some four centuries later, during the reign of Dom João IV. The castle is open 24 hours, with no admission charge.