A rotunda is a large, circular room or building, often topped with a dome. These structures are commonly found in architecture, serving as grand entrances or gathering spaces. The design allows for ample natural light and can create an impressive visual impact. Historically, rotundas have been used in various cultures, from ancient Roman temples to modern government buildings. They often feature decorative elements like columns and sculptures, enhancing their aesthetic appeal. Notable examples include the Pantheon in Rome and the U.S. Capitol in Washington, D.C..