The ancient core of the city of Termoli rises on the top of a promontory that juts out almost vertically over the Adriatic Sea.
The old village looks like a suggestive fortified citadel, characterized by very characteristic squares and alleys; among these is Vico Il Castello, one of the narrowest in Europe.
There are no archival sources documenting the history of the origins of Termoli, due to the Turkish sacking which took place in 1566, but the discovery of some necropolises in the Porticone and Difesa Grande localities testifies to the human presence in the area since the 6th century BC.