Windsor Castle, Berkshire England. The original castle was built in the 11th century after the Norman invasion by William the Conqueror. Since the time of King Henry I, it has been used by succeeding monarchs and is the longest-occupied palace in Europe. #jjexplores
Castle Schönbühel, Wachau region, Austria. Schönbühel stands on the edge of a high, and uneven, cliff in the Austrian valley of Wachau. Known as the "Keeper of the Wachau," the castle has stood here for more than 1000 years.