The Unknown Story of St. Peter’s Golden Sphere

Michie

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The Romans affectionately call it Palla (“the Ball”). Enthroned on the top of the dome of St. Peter’s Basilica, bearing the heavy white cross, it is meant to evoke the impact of Christ on the world, the mark of Christianity on earth.


This golden sphere is a precious element of the most famous church in the world, especially since deep cleaning work restored its former light and luster in 2003.

When seen from below, it seems so small that it is hardly conceivable that for centuries, the sphere has been a must-see stop for crowned heads from around the world. Indeed, very few people know it is possible to access the interior of the globe, which is big enough to welcome up to 16 people.


Completed July 20, 1593, the sphere was the final step, the crowning touch of the dome originally designed by Michelangelo and then slightly modified by architects Giacomo della Porta and Domenico Fontana. According to the Office of Conservation and Restoration of the Fabric of Saint Peter, the sphere — made of 54 trapezoidal-shape pieces of mercury-gilded bronze — rises to a height of about 410 feet from the floor of the basilica and measure more than 8 feet in diameter for a total weight of 4,104 pounds. It is accessible from the top of the dome thanks to a small ladder.

“Many 19th-century guides already highlighted the magnificence of this bronze globe, but its history is very little-known today” Pietro Zander, Director of the Office of Conservation and Restoration of the Fabric of Saint Peter, told the Register. “It was a highly coveted place in the 18th century, and the most prestigious travelers shared the desire to access the dome, especially the palla.”

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