The Four à Chaux in Lembach is an underground fortification of the Maginot Line from the 20th century. Managed and organised by the Association des Amis de la Ligne Maginot de Lembach, tens of thousands of visitors marvel at the extensive complex every year. Many exciting features, from the retractable machine gun cupola to the escape room, make the fort a popular excursion destination in Alsace. We are looking forward to intensifying our cooperation with President Joseph Haensli and his team, which has already begun successfully as part of the Upper Rhine Fortress Co-operation.