The oldest building is the Pantheon - the Temple of all the gods - was built in 27 BC by Marcus Agrippa. Between 118-128 years the church was thoroughly rebuilt by the Emperor Hadrian and gained the forms that it holds to this day.

Inscription on the architrave, reads: "Marcus Agrippa, son of Lucius, Consul Third, did." Her left Adrian, who did not put his name on any of the sites. Reconstruction carried out on the project Apollodorus of Damascus, has modified the original look of the building. Preserved vast portico formed by eight columns of gray granite. Two columns of red granite stand behind the first, third, sixth and eighth column, forming three passes. The tympanum was once decorated with a bronze eagle with a crown. The ceiling of the portico was also decorated with bronze, removed on the orders of Pope Urban VIII Barberini, hence the now famous phrase: "What the barbarians did not do, the Barberini did." The dome crowning the building - a true masterpiece of engineering - was created entirely on the wooden formwork and is the widest of all ever built domes.

Inside the building on the sides are six niches, each of which is framed by two columns. The dome is decorated with five rows of decreasing up caissons, except the last row around the circular hole, the so-called "eye of the Pantheon", with a diameter of 9 meters, through which flows into the stream of light.

Who is the national Pantheon mausoleum. First his desire to be buried here expressed artist Raphael. Later buried here other famous personalities, including representatives of the Savoy royal family.