The Abbey of Saint-Pierre-aux-Nonnains is a historic monastery located in Metz, France. Founded in the 7th century, it is one of the oldest religious buildings in the region. The abbey was originally established for women and has undergone various transformations over the centuries, reflecting different architectural styles. Today, the abbey is known for its impressive Romanesque architecture and beautiful stonework. It houses a museum that showcases artifacts related to its long history. The site is also significant for its connection to the early Christian community in Metz and its role in the development of monastic life in the area.