Its crenelated battlements, built in the Middle Ages, are studded with huge doors: the oldest ones were built as defences to hold back invaders.
The Great Mosque, built in the 9th century, occupies a central position.
The archaeological site of Dougga is one of the most spectacular in Tunisia.
The Romans destroyed the city in 146 BC, then rebuilt it and made it the capital of the rich province of Africa.
Some fragile remains of Punic Carthage can still be seen today: the areas where Mago and Hannibal lived and the Punic ports.
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Those butterflies of excited joy as you open the latest message from your new match, your first glimpse as you turn up for a date, a shared joke that only the two of you understand; these moments begin with e Harmony.