The Pantheon, located in Rome, Italy, is amongst the greatest architectural feats of the ancient Roman Empire. Originally built as a temple to all the gods of Rome, the Pantheon was constructed by Marcus Agrippa during the reign of Augustus (27 BC - 14 AD). After being destroyed by a fire in 80 AD, it was rebuilt by Emperor Domitian, only to be struck by lightning and burnt down again in 110 AD. The Pantheon that stands today was constructed in 120 AD by Emperor Hadrian, who chose not to inscribe his name on it, retaining the original inscription of Agrippa.
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The Pantheon is renowned for its architectural brilliance, especially its massive dome, which remains the world's largest unreinforced concrete dome to this day. The structure is circular with a portico of large granite Corinthian columns under a pediment. The height to the oculus and the diameter of the interior circle are the same, 43.3 meters, symbolizing the perfect balance of the cosmos. The dome's central opening, or oculus, allows natural light to illuminate the interior, creating an awe-inspiring spectacle.
Originally, the Pantheon served as a temple for all Roman gods, hence its name derived from the Ancient Greek words pan (all) and theon (gods). After the fall of the Western Roman Empire, it was consecrated as a Christian church, known as Santa Maria Rotonda or Santa Maria ad Martyres, which has ensured its survival. Today, it serves not only as a place of worship but also as a tomb. It houses the remains of notable figures including the artist Raphael and several Italian Kings.
The Pantheon remains an active church today and is a major tourist attraction, drawing millions of visitors each year. It stands as a monument to the grandeur of the Roman Empire and continues to inspire and influence contemporary architecture. Its engineering and architectural feats continue to be studied and marveled at by architects, historians, and visitors from around the world.
Despite being nearly two millennia old, the Pantheon’s dome remains the world's largest unreinforced concrete dome. The term 'Pantheon' is actually a misnomer since the building was never officially consecrated as a temple. The oculus at the dome's apex and the entry door are the only sources of natural light in the interior. During rains, the rainwater drains away through tiny, almost invisible holes in the sloping floor.