Only fifteen feet in diameter, this structure has a stepped base and a continuous row of Doric columns called a peristyle.  
Only fifteen feet in diameter, this structure has a stepped base and a continuous row of Doric columns called a peristyle.  These columns support a balustrade crowned by a hemispherical dome, which sits over a small cella, or sanctuary.  It was commissioned by Ferdinand and Isabella to mark the spot where Saint Peter was supposedly crucified.  Located on the grounds of the Church of San Pietro in Rome, this is, FTP, what shrine built in 1502 by Donato Bramante?
Only fifteen feet in diameter, this structure has a stepped base and a continuous row of Doric columns called a peristyle.  
Tempietto