The Pantheon (Latin: Pantheon, from Greek Πάνθεον meaning "every god"), an ancient building in Rome, Italy. Built in 118–128 AD. on the site of an earlier building commissioned by Marcus Agrippa during the reign of Augustus (27 BC. - 14 AD.).
The present building was completed by the emperor Hadrian and probably dedicated about 126 AD. He retained Agrippa's original inscription.
It is one of the best-preserved of all Ancient Roman buildings. It has been in continuous use throughout its history, and since the 7th century, the Pantheon has been used as a church dedicated to "St. Mary and the Martyrs" (Latin: Santa Maria ad Martyres) but informally known as "Santa Maria Rotonda".
more on https://en.wikipedia.org/wiki/Pantheon,_Rome