Each square links to a 12 000 by 12 000 pixel sub-image. Although in principle these images could be displayed in a browser, because of their large size (some are over 100MB) it is best to download the image for local viewing. This can be done by right-clicking on the subimage and selecting "save target as" (in Internet Explorer), "save link as" (in Firefox), "download linked file as" (in Safari), etc.