After the map gallery, we entered some of the rooms with Renaissance paintings...where we waited a bit until we could take a short cut into the corridors leading to the Sistine Chapel. No photography is allowed in the Sistine Chapel. Guides are not allowed to "guide" or discuss the artwork in the Chapel, so she took time in the courtyard before we entered the museum, using photographs, to interpret what we would see at the end of tour and to point out things to look for. once we were in the scrum, er, i mean Chapel.
People are loud despite the ominous "shush" sound broadcast every 2 to 3 minutes, depending on how cooperative the crowd is being, it will settle for a minute or two before the roar rises and the "shush" comes again. People stand shoulder to shoulder (hang on to your valuables!) looking up, while guards, keep ushering the flow towards the exit. If you'd like more time, swim your way to the middle of the room where the currents are slower and you'll have more tome to explore the amazing Michelangelo ceiling and Last Judgment altar piece. Photography is not allowed, and our guide explained that being a soverign country, the guards are welcome to arrest and even detain you for a while if you don't follow their rules. We didn't see any heavy handed tactics, despite seeing some disrespectful folks not adhering to the rules.
After examining the Sistine Chapel for a while, we met back up with our guide who led us out of the Vatican Museum, giving us an opportunity to "peek" at the Simonetti Staircase.