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Haute-Ville

Fortified city of Boulogne-sur-Mer with castle in foreground and Basilica of Our Lady of the Immaculate Conception in background.

© eyewave/Getty Images/iStock

Boulogne's hilltop Upper City is an island of centuries-old buildings and cobblestone streets. You can walk all the way around this 'Fortified City' atop the ancient stone walls – look for signs for the Promenade des Remparts.

Highlights here include the Basilique Notre Dame, the Château-Musée, the neoclassical Hôtel Desandrouin and the 18th-century Hôtel de Ville with a medieval belfry.

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