Don't Eat the Pictures: Sesame Street at the Metropolitan Museum of Art (1983)

As the Metropolitan Museum of Art closes, Big Bird decides to leave his Sesame Street friends behind in search of Snuffy. Once locked inside for the night, educational hilarity ensues as Big Bird and Snuffy team up to help a ghost of a small Egyptian boy solve a mysterious riddle. The rest of Sesame Street's residents search for Big Bird.