This is a replica of the Saint Paul Cathedral located in London, made entirely in blender and it uses a full set of tileable textures and trim sheets (for the most part, some assets contain their own texture sets) with a full set of vertex painting to blend 3 types of textures together for each material.
The scene contains 383 individual meshes and it uses 5900+ objects instancing those meshes, so the scene uses the modular kit approach.
If you do not count the instancing polycount, the whole scene contains only 1.5M faces.
In order to buy this scene, you can get the model with the textures and the unreal project used to render all the still images shown here, in my artstation marketplace store.