The museum has multiple galleries that are filled with images from the lessons section and will sometimes house a few additional photos per civilization, as needed for further study. The extended information has been purposely removed from the images in order for them to be used as study tools and for slide identification practice. To view the information for a particular image, simply go back to the lesson to which it belongs. (For images that have not been studied within the lessons, information is provided so that you are aware of what you are viewing; and to differentiate between the "study" images vs. the "additional" images.)
To begin, simply hover over the museum menu and click on the collection that you wish to enter.
Good luck with your practice and studies!