Notre-Dame de la Garde, known to local citizens as la Bonne Mère, is a Catholic basilica in Marseille, France, and the city's best-known symbol. The site of a popular Assumption Day pilgrimage, it is the most visited site in Marseille. It was built on the foundations of an ancient fort at the highest natural point in the city, a 149 m (489 ft) limestone outcropping on the south side of the Old Port of Marseille.