Between 1934 and 1936, when the project of Via della Conciliazione was developed, the architects Marcello Piacentini and Attilio Spaccarelli chose to give to the new road the alignment of Borgo Vecchio, and not of the nearby Borgo Nuovo, which had been aligned between the now disappeared tower of Alexander VI near the Ponte Sant'Angelo and the bronze gate of the Vatican, and had a slope of 6 degrees with respect to the old Saint Peter.