Exploring how architectural heritage changes over time is key for its documentation, conservation, and public understanding. Advances in physical computing, like sensors and digital projections, make projection mapping a promising tool for depicting heritage directly on buildings, offering a more contextual and experiential understanding. This paper discusses using an interactive projection mapping installation, controlled by a tangible user interface, to convey the spatiotemporal evolution of a medieval chapel over 850 years. Findings indicate enhanced visitor engagement and social interaction, suggesting recommendations for integrating such technologies in heritage presentation.