A dome is a rounded structure that is often used in architecture to create a spacious interior. It is typically formed by a curved surface that rises to a peak, resembling the shape of a half-sphere. Domes can be made from various materials, including concrete, wood, and metal, and are commonly found in buildings like churches, mosques, and government structures. One famous example of a dome is the Pantheon in Rome, which features a large circular opening at the top called an oculus. Domes are not only aesthetically pleasing but also provide strength and stability, allowing for large open spaces without the need for many supporting columns.