St. Peter's Basilica Underground Tour

Entry to St. Peter's Basilica itself is free, but a guided underground tour (from $38.59) gives you a licensed Vatican guide, radio headsets, access to the Vatican Grottoes with the papal tombs, the chance to touch the original 4th-century Constantinian walls, and — with the dome-climb option — a ticket to the top of the Michelangelo dome. Without a booking you can only join the free queue and visit the main floor on your own.

This tour includes a complete guided walk of St. Peter's Basilica, the papal tombs in the Vatican Grottoes, a professional licensed guide, radio headsets so you can hear the guide clearly inside the Basilica, and — if you select the Dome Climb option — entry tickets to the top of the dome. Entry to the Vatican Museums and Sistine Chapel is not included.

The Michelangelo dome of St. Peter's Basilica has approximately 551 steps from ground level to the cupola viewing platform. The elevator (included with the dome-climb option) covers the first section to the inner balcony, leaving roughly 320 additional steps to the very top. The staircase narrows and curves with the inner shell of the dome, so a steady pace is recommended. See our dome climb guide for what to expect step by step.

Yes, the main floor of St. Peter's Basilica is free to visit. However, climbing the dome (paid ticket, included in this tour's dome-climb option), the guided Vatican Grottoes visit, and the deeper Scavi necropolis (a separate, permit-only Vatican excavation) are not free. Free walk-up entry also provides no guide or headsets — inside a Basilica the size of a football pitch, commentary makes a significant difference.

The Vatican Grottoes are the upper underground level directly beneath the main Basilica floor — they hold the papal tombs and the Confessio above St. Peter's Tomb, and they are what this tour visits. The Scavi (Necropolis) is one level deeper, where the original 1st-century burial site sits beneath the Constantinian foundations. The Scavi requires a separate permit booked months in advance directly with the Vatican's Ufficio Scavi — it is not part of any standard guided tour. See our Scavi tour vs. Vatican Grottoes guide for a full comparison of both underground levels and how to book each.

Yes — the Basilica is open to the public for free, but expect queues of 1–3 hours in peak season, mandatory security checks, and no commentary inside. The guided underground tour gets you a licensed Vatican guide, headsets, access to the Vatican Grottoes' papal-tomb area, and the chance to touch the original 4th-century walls — none of which is accessible via the free walk-up queue. To pick the quietest slot, see our best time to visit St. Peter's Basilica guide.

This guided tour runs 1.5 to 2.5 hours, depending on whether you choose the Regular option (Basilica + Papal Tombs) or the Dome Climb option (which adds the ascent to the cupola). Arrive at least 15 minutes before your start time at Piazza della Città Leonina for headset distribution and the mandatory security check.

Yes. The tour visits the Vatican Grottoes directly above St. Peter's Tomb — including the Confessio (the small marble crypt beneath Bernini's Baldachin) and the papal tombs lining the underground walls. You will also see and touch the original 4th-century Constantinian Basilica walls. The 1st-century archaeological tomb chamber itself is one level further down in the Scavi — a separate, permit-only Vatican tour. Our Scavi vs. Grottoes guide explains the difference between the two underground levels.

There is a strict dress code: shoulders and knees must be covered for both men and women, with no exceptions — no shorts, tank tops, or sleeveless dresses even in summer. A light scarf or shawl over the shoulders works if you forget. Comfortable shoes are essential: the tour covers long marble floors and, with the dome-climb option, roughly 320 steps inside the dome. All visitors also pass mandatory airport-style security. Our dress code, security and rules guide covers everything to wear, bring, and leave behind.

On this tour, the dome climb is a bookable option. A ticket-included elevator takes you to the first terrace level, saving roughly 230 steps; from there, approximately 320 narrow steps inside the inner and outer dome shells lead to the cupola viewing platform and a 360° panorama over Rome. The climb is not suitable for guests with claustrophobia or significant mobility difficulties. Read our St. Peter's dome climb guide for exactly what the ascent is like and practical tips.

Based on 4,144 verified reviews averaging 4.8/5 — and a 'Likely to sell out' badge from GetYourGuide — yes. From $38.59 you get a licensed Vatican guide with headsets, the Vatican Grottoes, the papal tombs, and the original 4th-century walls, all of which the free entry does not cover. Free cancellation applies up to 24 hours before your start time, so booking early carries no real risk.

The meeting point is Piazza della Città Leonina, 2, just outside St. Peter's Square in Vatican City. Look for staff holding a red 'KAY KAY TOURS' sign. Arrive 15 minutes before your scheduled start — the team distributes radio headsets there and guides the group through security. The piazza is a 10-minute walk from Ottaviano metro station (Line A).