A rotunda is a large, circular room or building, often topped with a dome. It is commonly found in architecture, especially in public buildings like museums, libraries, and government structures. The design allows for an open and spacious interior, making it an ideal space for gatherings and events. Historically, rotundas have been used in various cultures, with notable examples including the Pantheon in Rome and the United States Capitol in Washington, D.C. Their architectural significance lies in their aesthetic appeal and structural innovation, often symbolizing grandeur and civic pride.