The Key to the World is a key that rests in the Tower of Power. If someone possesses the key, they are given the ability to rule the world.
The Key to the World is dark blue with a globe emblem on it.
The key has appeared in two episodes of The Backyardigans: "Race to the Tower of Power" from season one, and "Cops and Robots" from season two. In the latter episode, the key's design is used for the key to the robot factory.