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Photo: Bernard Gagnon, CC BY-SA 3.0 via Wikimedia Commons
Ruins of the largest Roman baths outside Rome itself. The site also has a Punic cemetery, some old houses, some Punic kilns, a chapel, some graves, and mosaics. Guides are available in a number of languages, and may be worthwhile as the site is large. It is illegal to take photographs in the direction of the presidential palace. Doing so, especially when traveling alone, may land you in jail for up to 3 years, though the guards don't appear too concerned.
The Baths of Antoninus or Baths of Carthage, located in Carthage, Tunisia, are the largest set of Roman thermae built on the African continent and one of three largest built in the Roman Empire. They are the largest outside mainland Italy. The baths are also the only remaining Thermae of Carthage that dates back to the Roman Empire's era. The baths were built during the reign of Roman Emperor Antoninus Pius.
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Carthage Palace
You can walk past the president's well-guarded palace, which includes a private boat moor and helicopter pad, on the main road. You can also see it from the Antonine Baths, and the ruins above (cross under the TGM railway bridge, then turn right up the hill).
Most remnants excavated from the ruins have been stored in the cavernous museum located on Byrsa Hill, documenting both the Punic and the Roman eras. Signs within the museum are entirely in Arabic and French. On the second floor, the part nearer to the staircases showcase artifacts from Roman times, and the inner part the artifacts of the earlier Punic period. Fascinating artifacts such as alabaster jars and jewelry remain. The descriptions of the Roman conquest and the legend of Dixon are also vivid, but sadly, inaccessible to English speakers. The museum grounds offer sweeping views of the coast and city, and also include the ruins of some Punic streets, the former site of a public library, numerous sculptures, a chapel or church, some excellent mosaics and some coffins. A few benches under the trees with a great view make for a good resting spot. Unfortunately many items about the grounds are unlabelled, so a guide may be useful (or eavesdrop on a tour group if you can). Ignore the shifty guy trying to charge you 1 DT to use the toilet. As of Nov 2018 visitors are allowed to access museum grounds only, while museum building is closed for reconstruction.
This historic Christian temple was surrounded by a vast cemetery. Rediscovered in 1915, it was oriented toward a spectacular ocean view which can still be enjoyed. The temple is thought to have been dedicated to the well being of seafarers. All of the valuable remains have been removed, leaving the site somewhat empty. On the plus side, it makes a good picnic spot and there's a chocolate and pastry store right nearby with a service station opposite for drinks. Located very far north relative to most of the Carthaginian ruin sites, this is a good option for the start of a long day's walking.
The cemetery is the final resting place for 2,841 American military Dead lost during the War in North Africa. A monument is inscribed with the names of 3,724 Americans whose remains were never found or identified. The memorial court contains large maps in mosaic and ceramic depicting operations across Africa.
Oceanographic Museum
Built in 1924 under President Zine El Abidine Ben Ali on the site of the Carthaginian war harbour. Collection of stuffed birds and animals, several aquariums, skeletons of fossil fishes.