A cupola is a small, dome-like structure that sits on top of a building, often used for ventilation or as a decorative feature. It can be found on various types of architecture, including churches, government buildings, and homes. Cupolas can be made from different materials, such as wood, metal, or glass, and they often have windows to allow light and air to enter. In addition to their aesthetic appeal, cupolas serve practical purposes. They help to release hot air and smoke from the interior of a building, making them useful in structures like barns and factories. The design of a cupola can vary widely, reflecting the style of the building it adorns, from classical to modern designs.