Emerald City is a fictional city from L. Frank Baum's classic children's novel, "The Wonderful Wizard of Oz." It is known for its stunning green buildings and streets, which are made of emeralds and other precious materials. The city serves as the capital of the Land of Oz and is ruled by the Wizard of Oz. In the story, Dorothy and her friends travel to Emerald City in hopes of meeting the Wizard, who they believe can help them achieve their desires. The city symbolizes hope and the pursuit of dreams, making it a central location in their adventure.