Vatican museum/the chapel by MarikaNy
We walked straight in to the museum of Vatican, with no waiting. It was about 9.15 in the morning. Didn't have the ticket in advance. It was in the beginning of June this summer. Be prepaired to walk through the whole museum to get to the chapel, it takes about one hour even if you don't stop and look at all the marvellous paintings and statues on your way.
And don't go in the Vatican to get to the chapel, go straight to the museum (entrance outside the Vatican!) Afterwards go and see the church, there will be a long queue, but it goes fast.