Luxemburg-City, the city of bridges, is an uneven maze of relics, forts, cornices and alleys crossed by watercourses spanned by 110 bridges. In the Old City, visit the Du Bock castle whose first foundations were laid in 963 and which was renovated in 1963. The Cornice, also known as "the most beautiful balcony in the world" follows the 17th century tracing of the ramparts and enables to discover very beautiful baroque and renaissance-styled homes. The Fish-Market square, at the junction of ancient Roman roads, is the heart of the ancient city and shelters the national art and history museum. In the Upper Town, the Luxemburg's Notre-Dame Cathedral is one of the most beautiful illustrations of gothic style. In the Grund, stop over at Saint-John's church and at the Neumuster Abbey which was used as a prison until 1984.