The Atrium Sponza Palace scene is used by graphics developers and artists for rendering and global illumination testing, but it was created back in the 2000s and has been outdated. Thankfully, there is now a new version that is caught up with modern real-time rendering.
Unity's Technical Artist Kristijonas Jalnionis has presented the updated Sponza, with multiple improvements. They converted all of the materials to comply with PBR standards and made sure it is compatible with HDRP, URP, and Built-in Render Pipeline. The creator notes that the HDRP version is the most complete in terms of graphical features.