Visit Mont Saint-Michel

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).

Storybook fortress on a rock island ringed by a river canyon.

Island castle at the meeting of three sea lochs — Scotland’s most photographed.

Red-brick Gothic castle on an island in Lake Galve, home of the Karaim community and their kibinai pastries.

Cycle the Trail of the Eagles' Nests (Szlak Orlich Gniazd), a scenic route connecting medieval castles in Poland

Clifftop Transylvanian castle marketed as Dracula’s — worth it either way.

Moorish palace-fortress of Granada.

Historic fortress and the Crown Jewels.