The Pantheon (meaning 'temple of every god') is a former Roman temple, now a church, 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 confused its date of construction as the original Pantheon burnt down so it is not certain when the present one was built.
The building is circular with a portico of large granite Corinthian columns under a pediment. A rectangular vestibule links the porch to the rotunda, which is under a coffered concrete dome, with a central opening (oculus) to the sky. Almost two thousand years after it was built, the Pantheon's dome is still the world's largest unreinforced concrete dome. The height to the oculus and the diameter of the interior circle are the same, 43.3 metres.
Pantheon is one of the best-preserved of all Ancient Roman buildings. The Pantheon's large circular domed cella, with a conventional temple portico front, is 'unique' in Roman architecture. Nevertheless, it became a standard exemplar when classical styles were revived, and has been copied many times by modern architects.
Pantheon was converted into the church of St. Mary of the Martyrs in 608 CE. In 1270 a bell tower was added to the porch roof and later removed. Also, at some time in the Middle Ages the left side of the porch was damaged which necessitated the replacement of three columns. The first came from Domitian's villa at Castelgandolfo and was added in 1626. The other two columns came from the Baths of Nero and were added in 1666. However, these additions were rose-pink in colour whilst originally the front eight columns of the porch were all grey and only the internal four were pink Aswan. Also in 1626 Pope Urban VIII removed all of the bronze girders from the porch roof and recast the metal into 80 canons for the city's Castel Sant'Angelo. The presence of these girders suggests that the porch roof originally had heavy marble tiles.
Despite these changes the Pantheon is one of the best preserved ancient monuments in the world and it still has an important function and status today as within it are the tombs of the Italian monarchy from 1870-1946 and another notable tomb is that of Raphael (1483-1520 CE).
Pantheon is visited by over 6 million people annually. It is part of the UNESCO World Heritage Site Historic Centre of Rome.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.