The Pantheon, Rome.

“The Pantheon (from Greek Pantheion, ‘[temple] of all the gods’) is a former Roman temple, now a church, in Rome, on the site of an earlier temple 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, which has caused confusion over its date of construction as the original Pantheon burned down, so it is not certain when the present one was built.”