The historic core of the city once was entirely surrounded by the city walls, the course of which remains visible also today, as a symbol of the city. In the 13th century, with the fall of the city and its environs to Venice, the walls were erected on the remains of Late Antique fortifications. The walls were renewed repeatedly. An older square tower stands next to the former city gate, while the round towers stem from the Renaissance. Thanks to its walls, the city of Novigrad is a member of the international association Walled Towns Friendship Circle (WTFC).