The oldest and largest inhabited castle in the world, the King’s weekend home, with St George’s Chapel and the State Apartments.
Red-sandstone castle ruin above the old town of Heidelberg and the Neckar valley.
Moorish palace-fortress of Granada.
Shogun-era castle famous for the pair of golden shachihoko dolphins on its roof and the lavishly rebuilt Honmaru Palace.
Explore Carcassonne, a fortified medieval city in southern France. Walk the double ring of ramparts of the Cité de Carcassonne (a UNESCO World Heritage site with 52 towers), admire the Basilica of Saints Nazarius and Celsus (known for its 12th-century stained glass and Gothic choir), and cross the Pont Vieux (a 14th-century stone bridge offering panoramic views of the city).
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