During the French Blockade (1798–1800), St Mary's Tower served as a prison for suspected spies. In 1829 the British Military abandoned the site. For several decades it was deemed to be property of the local civil authorities, and may have been used as an isolation hospital, or even as a wintering pen for farm animals. The tower again saw active service during both World War I and World War II. Since 1982 the tower has been the property of the Armed Forces of Malta. It now serves as a lookout and staging post to guard against contraband and the illegal hunting of migratory birds at sea. The tower underwent extensive restoration between 2002 and 2004. Today, it remains the most notable structure on Comino.