A rotunda is any roofed building with a circular ground plan, and sometimes covered by a dome. It may also refer to a round room within a building. The Pantheon in Rome is perhaps the most famous, and
Temple of Hercules Victor, in the Forum Boarium in Rome
Remains of the circular temple at Bairat. A stupa was located in the center, with a colonnade and a circular wall around. 3rd century BCE.
Ashoka's circular Mahabodhi Temple, Bharhut
Sanchi Stupa in India, a Buddhist pilgrimage site
The Pantheon is an ancient temple in Rome, Italy, originally built under emperor Augustus and reconstructed under Hadrian; since AD 609, it is a Catholic church called the Basilica of St. Mary and the
Rotunda
…It may also refer to a round room within a building (an example being the one below the dome of the United States Capitol in Washington, D.C.). The Pantheon in Rome is perhaps the most famous, and is the most influential rotunda. A band rotunda is a circular bandstand, usually with a dome. The terminology…
The interior of the Pantheon
The inscription at the entrance of the Pantheon reads, in Latin: M⸱AGRIPPA⸱L⸱F⸱COS⸱TERTIVM⸱FECIT