The Haut-Koenigsbourg is the most renowned and most visited fortified castle in Alsace. Half a million people explored the citadel in 2019, and the number of visitors has increased by 4% in one year. One in four tourists is a child, and the castle emphasizes school and extracurricular visits. The French were the most numerous to climb to the site in 2019, ahead of the Germans, Belgians, and Spanish.