Saarbrücken is mainly a modern industrial city, and capital of the state of Saarland, sandwiched between the Rhineland and the French and Luxembourg frontiers. The city lies on the River Saar, a Moselle tributary. Saarbrücken is a modern industrial city. Attractions include the Church of St Ludwig and Ludwigsplatz (1762-75); the Collegiate Church of St Arnual (13th and 14th centuries); a palace with grounds and a Gothic church; and a Franco-German garden with a miniature town (Gulliver’s Miniature World). Close to Saarbrücken, at Völklingen, is the Hütte Steelworks UNESCO World Heritage Site.