Força Vella - In the first century BC, the Romans built a mighty fortress with an almost triangular perimeter (a kind of acropolis) which is known as Força Vella. The fortress was very well protected by a defensive rampart built from large stone ashlars. This was the first city enclosure and it remained unchanged until the year 1000. Parts of this wall can still be seen today.
The Walls- The extension of the Roman walls during the medieval ages today enables visitors to stroll along a walkway following some sections of the longest Carolingian walls in Europe (9th century). The various towers are excellent vantage points offering views over the city and the surrounding areas.