Climbing St. Peter's Dome is one of the best experiences in Rome and the perfect way to crown (quite literally) your visit to the Vatican. The dome Michelangelo designed at the age of 72 is a masterpiece of Renaissance engineering: at 136 metres high, more than four centuries later it is still the tallest dome in the world, and its silhouette is the symbol of the city, visible from almost anywhere in Rome.
The climb has two rewards. The first is the terrace, level with the base of the dome, where you look down into the basilica from above, walk among the statues on the roof and see the dome's outer shell up close. The second, after climbing a narrow staircase that curves with the dome itself, is the lantern: from there, St. Peter's Square spreads out below you with its perfect ellipse, along with the Vatican Gardens, the Tiber and the sea of Roman rooftops all the way to the hills on the horizon. It's a view you won't forget.
This practical guide explains how the climb works (the two options, with and without the lift), how much it costs, when to go to avoid queues and heat, and what to keep in mind if you suffer from claustrophobia or mobility problems, because the last stretch is always on foot, narrow and sloping. Entry to the basilica is free, but the dome is paid: € 8 for the stairs or € 10 with the lift to the terrace.
The dome was designed by Michelangelo, who took charge of the works on the new St. Peter's Basilica in 1547, already an old man. Inspired by Brunelleschi's dome of Florence Cathedral but aiming to surpass it, he designed a double-shell dome of colossal proportions. He died in 1564 without seeing it finished: only the drum had been built. It was completed by his successors Giacomo della Porta and Domenico Fontana, who closed it in 1590 under Pope Sixtus V, raising it somewhat higher than Michelangelo had planned. At about 136 metres to the cross and more than 42 metres in internal diameter, it is the tallest dome in the world and gave the largest church in Christendom its definitive crown. The full story of its construction is on our history page.
Read the full history ↓The monumental heart of the Vatican: St. Peter's Basilica, raised over the apostle's tomb, Michelangelo's dome and the great elliptical square embraced by Bernini's colonnade.
Read the history of The Basilica and the Square →A local guide tells you in half an hour what no sign at the site will ever explain. We look ours up on Civitatis: guided in Spanish and booked online with no fuss. They have over 50 activities in Roma. And there are free tours here: you book without paying and tip the guide whatever you think at the end, so trying one costs you nothing. Three are below so you get the idea: tap any of them and they all open.
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Origins, formation and what the sources say.
When Pope Julius II decided in 1506 to demolish Constantine's old basilica and raise a new and colossal St. Peter's, a huge challenge was there from the very start: how to roof such a vast space. The first architect, Donato Bramante, imagined the building as a great Greek cross crowned by an enormous dome to rival that of the Pantheon of ancient Rome, the concrete dome that had already been standing for fourteen hundred years. So the idea of a great dome over the tomb of St. Peter was part of the project from the beginning.
But building a dome of that size was no easy matter. When Bramante died in 1514, the work had barely got as far as the four central piers meant to carry the weight. For decades, architect after architect (Raphael, Peruzzi, Antonio da Sangallo the Younger) changed the plans, argued over the shape of the floor plan and left the problem of the dome unsolved. Sangallo even built a gigantic wooden model of his own version, which is now kept in the Vatican.
The challenge of the dome would fall to the greatest artist of his time. In 1547, at over seventy years of age, Michelangelo Buonarroti reluctantly agreed, at the wish of Pope Paul III, to take charge of the work on St. Peter's, and he refused any payment. He saw it as a religious duty. His contribution would be decisive: he revived Bramante's idea of a central plan, simplified and unified the chaotic project that had built up over the years and, above all, designed the dome that today crowns the basilica and the skyline of Rome.
Michelangelo was not starting from scratch. He had the greatest possible precedent in front of him: the dome of Florence Cathedral, which Filippo Brunelleschi had raised a century earlier, the first great dome of the modern era. Michelangelo, a Florentine himself, knew that work well and took it as his starting point, but he set out to surpass it. He studied its double-shell system (two domes, one inside the other, joined by ribs, which reduce the weight and make construction easier) and adapted it to the even larger scale of St. Peter's.
Michelangelo's design is a masterpiece of balance between structure and beauty. He planned a tall cylindrical drum ringed by paired columns, on which the dome rests, with sixteen ribs rising up to the lantern. He conceived the dome as roughly hemispherical, sturdy and powerful. Before he died he had finished the drum and left a large wooden model that set out his idea precisely, so that the work could go on without him.
Michelangelo died in 1564, aged 88, without seeing his dome closed: only its base, the drum, had been built. But his design and his model were so clear that they shaped the final result for good. It was his last great work, the crowning achievement of a life devoted to sculpture, painting and architecture, and perhaps the most ambitious of all: topping the largest church in Christendom with a dome that would be both a technical feat and a spiritual symbol.
Finishing the dome was left to Michelangelo's successors. In 1588, driven by the energetic Pope Sixtus V (the same pope who had moved the obelisk to the square two years earlier), the architects Giacomo della Porta and Domenico Fontana began building the dome's shell. In an astonishingly short time for such a work, just about two years, they closed it: the dome was finished in 1590, while Sixtus V was still alive.
Della Porta made one important change to Michelangelo's model: he raised the dome's profile, making it somewhat more pointed and slender and lifting it above the hemispherical shape the master had planned. It was a technical and aesthetic decision at once (a more raised dome spreads the thrust better) and it gave the silhouette its final elegance. The lantern on top was completed shortly afterwards.
The result is about 136 metres in height from the floor to the top of the cross, with an inner diameter of more than 42 metres. More than four centuries later, it is still the tallest dome in the world: no other has surpassed it in height. In the 18th century, when worrying cracks appeared in the structure, iron rings were fitted to reinforce it, and the dome has stood firm ever since. Its interior was covered with gold mosaics of saints and angels, and around the base runs the Latin inscription with Christ's words to Peter.
The dome of St. Peter's quickly became the symbol of Rome and a universal icon of architecture. Romans affectionately call it 'il Cupolone' (the big dome), and according to tradition, seeing it framed at the end of a street from certain spots in the city brings good luck. Its silhouette dominates the Rome skyline and can be seen from viewpoints such as the Gianicolo, the Pincio or the terrace of the Vittoriano.
Its influence was enormous. For centuries, Michelangelo's dome served as the model for great domes all over the world: St Paul's Cathedral in London, the Panthéon in Paris (Sainte-Geneviève), the Capitol in Washington and many others drew, directly or indirectly, on the Vatican model. The combination of a drum with columns, a ribbed shell and a lantern became the classical language of the monumental dome.
Beyond its technical influence, the dome carries huge symbolic weight: from the sky, it marks the spot of St. Peter's tomb and the heart of Catholicism. Climbing it, visitors physically walk through Michelangelo's work, move between its two shells and reach the lantern to look out over Rome at their feet. It is one of the few monuments in the world that can be both admired from afar, as the outline that defines an entire city, and experienced from within, climbing up through its insides. Four and a half centuries after it was closed, Michelangelo's dome still crowns the largest church in Christendom and is still the tallest ever built. Every night, lit up, it stands out against the Roman sky like a signature of Renaissance genius; and every day, thousands of visitors climb its steps to look out from the lantern over the city, repeating a gesture that links the present to the ambition of those popes and architects who, half a millennium ago, dared to dream up the impossible dome.
