Biggest Byzantine fortress
Ain Tounga is often said to have to be finest Byzantine fortress in Tunisia. The fortress was built in the 6th century, and has 5 square towers. One stands at almost its original height.
Although little has been done in terms of restoration, the walls still stand high and one tower still stands to its original height (top photo). On the other side of this, the wall is complete in its full length between two towers.
Behind the fortress lies the Roman ruins of Thignica which is definitely worth a visit, having an interesting market, an amphitheatre, a theatre and baths looking almost like a church.
There is nothing to aid a traveller at site. Nearest hotel and decent restaurant is at Teboursouk near Dougga.
In order to get here, you may easily go by bus or shared taxi from Testour or Dougga, but getting a new connection may involve some waiting, as at least shared taxis pass this point full.