The Pantheon – the best preserved monument of Roman antiquity – is remarkably intact for its 2000 years. This is despite the fact that Pope Gregory III removed the gilded bronze roof tiles, and Pope Urban VIII ordered its bronze roof stripped and melted down to cast the canopy over the altar in St. Peter’s and cannons for Castel Sant’Angelo. The Pantheon was rebuilt after damage by fire in AD 80, and the resulting brickwork shows the extraordinarily high technical mastery of Roman builders. Its 43-meter dome, the supreme achievement of Roman interior architecture, hangs suspended without visible supports – these are well hidden inside the walls – and its nine-meter central opening is the building’s only light source.

The harmonious effect of the interior is a result of its proportions: the height is the same as the diameter. Although the first Christian emperors forbade using this pagan temple for worship, in 609 Pope Boniface IV dedicated it to the Virgin and all the Christian martyrs, and since then, it has become the burial place of Italian kings (Victor Emmanuel II is in the second niche on the right) and other famous Italians, including the painter Raphael.