- Duration: 50 minutes for an express tour & 1.5 hours for an elaborate secret & mysteries tour
- Languages: English, Italian, French (subject to seasonal availability)
- Accessibility: Due to narrow staircases and uneven floors, this tour is not recommended for visitors with mobility limitations, claustrophobia, vertigo, heart conditions, or expecting mothers. Children under 6 are also not permitted.
- Booking: Advance booking is highly recommended due to limited tour availability.
- Timings: 9:15am - 2:45pm (daily)