The inscription on the architrave of the portico "M. Agrippa L. F. Cos tertium fecit" refers to a temple erected by Agrippa in 27 B.C. to the tutelary divinities of the Julia family. In reality Agrippa's building was destroyed by a great fire in A.D. 80. Recent studies have proven that the present Pantheon is a reconstruction of the temple from the time of Hadrian.
The interior measures 43,40 metres in diametre, and the same in height. Light and air still enter through the opening at the top (a circle of 8m. 92cms in diameter).
Address: Piazza della Rotonda