The site museum at Djemila houses the floor mosaics and other objects recovered from the ancient city, and it alone would justify the visit. The mosaics are the highlight — large, intricate compositions covering entire room floors, removed from their original contexts to be preserved and displayed under cover.
The collection includes the "Triumph of Venus," mythological hunting scenes, geometric patterns, and figure compositions showing aspects of daily life. The colours have survived remarkably well: the blues, reds, and ochres are still vivid. The workmanship reflects the wealth that flowed through this region during the late second and third centuries AD.
Other items include carved architectural fragments, sculpture, inscriptions, and coins. The museum is modest in scale but focused — everything here comes from the site itself, giving context to what you've seen (or are about to see) on your walk through the ruins.
Visit the museum either at the start or end of your site visit. French-language signs are the main interpretive tool; English-speaking guides can sometimes be arranged through the site administration.