A rotunda is a ROUND, domed building. It is a type of circular building with a dome-shaped roof and often has a symmetrical plan. The term is derived from the Latin word rotundus, meaning 'ROUND'. Rotundas have been used throughout history for a variety of purposes, including as places of worship, government buildings, and even as monuments. They are often found in public spaces, such as parks and plazas, and can be seen in many cities around the world.