The set of the Goblin City was built on Stage 6 at Elstree Studios near London, and required the largest panoramic back-cloth ever made. According to Production Designer Elliot Scott, the biggest challenge he faced was building the forest Sarah and her party pass through on their way to Jareth's Castle. The film's production notes state, "the entire forest required 120 truckloads of tree branches, 1,200 turfs of grass, 850 pounds of dried leaves, 133 bags of lichen, and 35 bundles of mossy old man's beard."