Chepstow Castle, River Wye, Wales, built in former home of William The Marshal. Oldest surviving post-Roman stone fortification in Britain. The castle originally had the Norman name of Striguil, derived from the Welsh word ystraigl meaning "river bend".
Prague Castle is a castle in Prague where the Kings of Bohemia, Holy Roman Emperors and presidents of Czechoslovakia and the Czech Republic have had their offices. The Bohemian Crown Jewels are kept within a hidden room inside it.
Places I've been: Mount San Michel, France. ✮ Mount San Michel at certain times is engulfed by the water and reveals the splendor of construction. Set in a medieval town called Avranches, this monastery was fortified in the thirteenth century.