Final answer:
Gian Lorenzo Bernini designed Saint Peter's Square with massive Doric columns, totaling 284 columns encompassing the square.
Step-by-step explanation:
The famous Saint Peter's Square is known for its grand design by Gian Lorenzo Bernini, which includes numerous statues of Saints and large columns. Bernini constructed the colonnade with massive Doric columns, standing four deep, to encircle the square. Given the design specifics, each of Bernini's straight covered wings - Charlemagne on the left and Constantine on the right - is 120 meters long and attached to the basilica facade. With these dimensions and the fact that the columns are arranged in pairs, the total number of columns comes to 284 Doric columns.