Rotunda (noun)

A circular building or room, especially one with a dome.

Origin:

Late 18th century, from latin rotunda, meaning round building.

Examples:

1. The rotunda of the Capitol building was a stunning example of neoclassical architecture.
2. The rotunda of the museum was filled with ancient artifacts.
3. The rotunda of the library was a popular study spot for students.
4. The rotunda of the hospital was a bright and welcoming space.
5. The rotunda of the church was adorned with stained glass windows.