A cathedral's bell tower is a tall structure typically attached to a cathedral, designed to house bells. These bells are often used to signal the time, call the faithful to worship, or mark special events. The tower is usually built in a style that complements the overall architecture of the cathedral, showcasing intricate designs and craftsmanship. The bell tower can vary in height and design, ranging from simple structures to elaborate spires. Many famous cathedrals, such as Notre-Dame de Paris and St. Peter's Basilica, feature iconic bell towers that are significant landmarks in their respective cities.