Why did UNESCO recognize Old Quebec as a World Heritage site in 1985?

UNESCO recognized Old Quebec as a World Heritage site in 1985 primarily due to its unique status as the only remaining walled city in North America north of Mexico.1

The site is celebrated for its distinct old-world character, which is preserved through its historic fortifications, narrow cobblestone streets, and stone buildings. These features reflect a rich French Canadian cultural heritage that has been maintained for centuries. Within the city's walls, institutions such as the Notre-Dame de Québec Basilica-Cathedral, the Ursuline monastery, and the star-shaped Citadelle serve as enduring reminders of the area's military, religious, and colonial history.12