Free entry to Vatican Museums on last Sunday of each month.
There is free entry to the Vatican Museums on Sunday 29 December, between 09.00 and 12.30, leaving by 14.00.
It is not possible to reserve tickets, they must be bought that day at the museum ticket office.
The museums are open on the…
source https://www.wantedinrome.com/whatson/vatican-museums-free-on-sunday-29-december.html