The Samnite stronghold rises in a strategic position on the Tammaro valley, on the homonymous high ground at an altitude of 953 meters. The circuit of the walls is developed for about 1500 meters and uses, where existing, the natural defense consists of rocky spurs and overhangs. Characteristic of the walls is the double curtain wall, an external lower and the other back of about 3 meters compared to the first, between the two runs an embankment used for the path of patrol. The walls of Terravecchia, conquered in 293 BC by the Roman army led by Consul Papirio Cursore, are divided into a double wall forming a step, despite this technical expedient, which would allow the besieged a double defensive possibility, since you could deploy the soldiers in double file, one for each step, after a strenuous defense the city fell.

The Abbey of Santa Maria a Mare is a medieval monastic complex, built on the island of San Nicola. It represents one of the many jewels of the Tremiti archipelago.