A major Shropshire landmark, also now part of Telford, is The Iron Bridge, located in Ironbridge. It was the first bridge of its size in the world made out of cast iron. In the same area is the Ironbridge Gorge, a UNESCO World Heritage Site. The most important landmark in the area is The Wrekin. There is also the Lilleshall Monument erected to the Duke of Sutherland, which has recently been restored.