Queen Mary's Castle (クイーンマリーしろ, Queen Mary Castle) is a location in EarthBound Beginnings. The castle is situated in Magicant and guarded by three men. They allow Ninten to pass after he uses Telepathy to solve a riddle. Queen Mary herself is located in a room with a long, red rug. When first meeting Queen Mary, she will tell you of how the Eight Melodies were scattered, and begs you to find them all and learn the song. Later, Queen Mary's castle fades away with the rest of Magicant, after it is revealed that she was Maria all along.
The theme that plays in Queen Mary's Castle is Wisdom of the world.