Janne and I visited St. Peter's Basilica in the Vatican.Wonderful structure, and great to see the not-for-us gardens of the Vatican from above. Would be wonderful to visit. But can you ski in the Vatican?
If it ever snowed, and it probably sometimes has or will, there'd be enough slope somewhere in the garden. But there's no access!
The other option is the rock slope just in front the main presentation platform of the Vatican: