The Pantheon in its architectural environment. Opposite is the square of the Arch of Piety.

The porch of the Pantheon raised on a flight of five steps, creating a harmony between the square which was relatively empty and the volume of the building. This unequalled architecture succeeded to survive to two milleniums to offer us, still today, its original image.

The fantastic cupola with a diameter of 44 m covering the hall of the Pantheon. Only the oculus in the centre allowed the lighting of the interior.

A courtyard with a portico preceded the Pantheon. In its centre stood a triumphal arch, the Arch of Piety.