The Colonnades in St Peter's Square
The Colonnades consist of 284 Doric columns and 88 pilasters of travertine marble. These columns, 13m. tall, are arranged in four rows. With the trabeation surmounted by a balustrade, the overall height is 21m. Bernini built two straight covered wings (Charlemagne left, Constantine right) 120 m. long, to link with the basilica's façade. There are a total of 140 saints on top of the Colonnades.
This image has been used in the About Roma tourist guide