The remains of this former 10C Benedictine monastery are the main claim to fame of Sant Feliu, particularly the Porta Ferrada, a pre-Romanesque porch with horseshoe arches. The monastic outhouses are home to the Museu d'Història de la Ciutat, which features a local archaeological collection, a section devoted to the cork industry and the Espai Carmen Thyssen, which hosts a major exhibition of works of art from the famous baroness's collection each year.