This is a web viewer for a gigapixel panorama. 3.96 Gigapixels, technically. The full image resolution of the source panorama is 70,784 x 55,950 pixels. Use your mouse or touchscreen to zoom in on any detail from the cathedral you want to see, and drag to pan around the photo. The far-right icon toggles fullscreen mode.

For further details on the significance of each statue, and the architecture of the west face of the cathedral, see the Wikipedia article.