Vatican Museums and St. Peter's Basilica are separate
The Vatican Museums, including the Sistine Chapel, require a paid, timed ticket booked in advance. St. Peter's Basilica is free to enter but has its own queue and a mandatory security screening, similar to an airport check, before anyone may enter. Plan for both as distinct visits with different entrances and procedures.
Booking Museum tickets through the official channel
The official Vatican Museums website sells timed-entry tickets directly, typically with an adult price around €20 plus a small online booking fee. Booking a specific time slot lets you enter at that time rather than queuing from scratch. High-season slots can sell out weeks ahead, so book as soon as your dates are confirmed.
When official tickets are sold out
Reputable resellers and licensed guided tours can offer entry when the official site shows no availability, usually at a higher price that includes a booking fee or guide service. Compare what is actually included before paying extra, and check that any operator is established and reviewed, since not all offers represent genuine savings or guaranteed entry.
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Security, dress code and the dome
Both the Museums and the Basilica require covered shoulders and knees, and bags are checked at the entrance. The Basilica's security screening is mandatory for everyone, with no way to bypass it even with a paid ticket to the Museums. The dome climb is a separate paid option inside the Basilica, with stairs or a partial lift.