Historically, castle towers served three primary functions: defense, surveillance, and status. Defensively, towers provided "flanking fire," allowing archers to shoot at attackers who were trying to scale the "curtain walls" between the towers. Rounded towers, which became standard after the 12th century, were specifically designed to deflect projectiles from siege engines and eliminate "blind spots." Surveillance-wise, the height of a tower offered a 360-degree view of the surrounding landscape, ensuring early detection of approaching armies or smoke signals. Symbolically, the "Keep" or the tallest tower (the donjon) represented the lord's power and prestige; it was the strongest point of the castle and served as a final refuge during a siege. In 2026, many of these towers have been preserved to showcase medieval engineering, featuring "machicolations" (floor openings) through which defenders could drop stones or boiling liquids on enemies below.