IEEE ComputerThe term Projection-Based Augmented Reality denotes the use of projection technology to augment and enhance three-dimensional objects and spaces in the real world by projecting images onto their visible surfaces. Disney theme park designers use projection-based AR to create beautiful, dynamic, and interactive spaces that immerse guests in magical worlds. We present several examples of projection-based AR techniques used in Disney parks. We also describe the architecture and components of a Projector-Camera toolbox being developed by Walt Disney Imagineering and Disney Research Zürich to support this work. We outline some of the challenges and research opportunities presented by integrating projection-based AR techniques into a theme park environment.