Cathedrals are grand and often ornate buildings that serve as the principal church of a diocese, typically associated with the Bishop. They are known for their impressive architecture, which can range from Gothic to Romanesque styles, showcasing intricate designs and towering spires. These structures not only serve as places of worship but also as cultural landmarks, attracting visitors from around the world. Many cathedrals, such as Notre-Dame de Paris and St. Peter's Basilica, are renowned for their historical significance and artistic treasures, making them vital parts of Christian heritage.