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The Pantheon (Latin Pantheon, from Greek - Pantheon, meaning "Temple of all the gods") is a building in Rome which was originally built as a temple to all the gods of Ancient Rome, and rebuilt around 125 AD during Hadrian's reign. The term pantheon is now applied to a monument in which illustrious dead are buried. It is the best preserved of all Roman buildings, and perhaps the best preserved building of its age in the world. It has been in continuous use throughout its history. The design of the extant building is sometimes credited to the Trajan's architect Apollodorus of Damascus, but it is equally likely that the building and the design should be credited to the emperor Hadrian or his architects. Since the 7th century, the Pantheon has been used as a Christian church. The Pantheon is currently the oldest standing domed structure in Rome. The height to the oculus and the diameter of the interior circle are the same, 43.3 meters or about 145 feet.