The Fortifications of Antwerp are a series of defensive structures built to protect the city from invasions. Originally constructed in the 16th century, these fortifications included walls, bastions, and moats, designed to withstand artillery attacks. The most notable feature is the Antwerp Citadel, which served as a military stronghold. Over the years, the fortifications were expanded and modified, especially during the Spanish Netherlands period. Today, many sections of the walls and bastions remain, showcasing the city's rich military history. The fortifications are recognized as a significant part of Antwerp's heritage and attract visitors interested in historical architecture.