187 Metres. One Nave. Everybody Walks It Wrong.
A route through the largest church in the world, in the order that keeps you inside it, plus the Grottoes timing that catches most visitors out.
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The building is designed to make you feel small, and it works so well that most people stop looking at anything specific. They walk the nave, photograph the Baldachin, and leave. Everything worth seeing here is off the centre line.
Almost everyone walks straight up the nave. Turn right instead. Michelangelo's Pietà sits in the first chapel on the right, behind bulletproof glass installed after it was attacked with a hammer in 1972. He carved it at 24, and it is the only work he ever signed, on the band across the Virgin's chest. The glass reflects the nave lights, so stand to the left of centre and low: the reflection shifts off the Virgin's face and the surface of the marble comes back. On the way, look down. Brass markers run along the nave floor showing where the world's other great cathedrals would end if laid inside this one.
Bernini's bronze Baldachin stands over the papal altar, and directly beneath it is the confessio and the tomb the whole building was arranged around. Do not stop there. Walk to the last pillar on the right of the nave, where the 13th-century bronze statue of St Peter sits: six centuries of pilgrims have touched and kissed the right foot until the toes are worn flat and shining. Then keep going into the apse for the Cathedra Petri. Bernini lit it with a single alabaster window, and in the late afternoon the light through the dove is the best thing in the building.
The Vatican Grottoes run beneath the basilica floor and are free to enter. Roughly 91 popes are buried down there, John Paul II among the ones people queue for. Go down at the end of your visit, not the start. The Grottoes exit deposits you outside the basilica, near the dome ticket office, and getting back in means the security queue again. One hard constraint: on a 6:00 PM reserved booking the Grottoes are closed to the public. If the papal tombs are the reason you came, do not take an evening slot.
The Prayer Route starts on Via di Porta Angelica, is marked with yellow signs, and is staffed twelve hours a day by Fabbrica di San Pietro personnel. It enters through the Grottoes. It is for prayer and Mass, not for sightseeing.
The digital guide bundled with an online booking runs in 7 languages. The analog one you rent on site at the Desk in the Parvis runs in 11, adding Russian, Japanese, Korean and Polish. It gets you no dedicated entrance.
Long trousers for men, trousers or a skirt below the knee for women, shoulders covered for everyone. You are stopped at the police checkpoint in the square, before you have queued, and there is nothing to hire on site.
There is no cloakroom anywhere in the basilica. Travel with a small bag only. There is a stroller park under the portico, which is not signposted well and almost nobody finds.
Why it matters: Carved when Michelangelo was 24, and the only sculpture he ever signed, after he overheard visitors crediting it to someone else.
What to notice: The Virgin is rendered younger than her son. Michelangelo defended the choice for the rest of his life. Look at the fall of the drapery over her left knee: it carries most of the composition's weight.
Why it matters: Bernini's first major commission in the basilica, and the object that fixes the scale of everything around it.
What to notice: The four columns twist. That spiral is a quotation of the columns from the old Constantinian basilica this building replaced, so a 17th-century bronze is deliberately citing a 4th-century church that is no longer there.
Why it matters: The most touched object in the building, and the one that records its visitors physically rather than in a register.
What to notice: The right foot has been rubbed down to a smooth stub. Compare it with the left, which is intact and still shows carved toes. That difference is centuries of hands, made visible.
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