Fortifications of Antwerp
Antwerp was developed as a fortified city, but very little remains of the 10th century enceinte. Only some remains of the first city wall can be seen near the Vleeshuis museum at the corner of Bloedberg and Burchtgracht, and a replica of a burg (castle) named Steen has been partly rebuilt near the Scheldt-quais during the 19th century.
Source: Wikipedia — Fortifications of Antwerp (CC BY-SA 4.0)