What flagship attraction offers a ride through scenes from classic Disney films?

The Great Movie Ride is the correct choice because it was specifically designed to showcase iconic scenes from classic Disney films and other famous movies. This attraction, which was located at Disney's Hollywood Studios, provided guests with an immersive experience that featured animatronic figures, elaborate set designs, and memorable music from a variety of films, illustrating the rich history and magic of cinema.

The other attractions mentioned focus on different themes. The Haunted Mansion is centered around ghostly themes and spooky storytelling, rather than cinematic history. It's a Small World features a global journey showcasing cultures and children's songs rather than classic film scenes. Pirates of the Caribbean, while themed around a specific movie series, does not encompass the broader scope of classic Disney films that The Great Movie Ride presented. Thus, The Great Movie Ride stands out for its direct connection to classic film scenes, making it the flagship attraction that the question refers to.