Of interest, and one that causes one to stop and give serious reflection to, is the purported relic of St. Anne that is at the Basilica of St. Paul's Outside the Walls. This is a picture I took the last time I was in Rome, in 2006. The caption says "Ossa di S. Anna" (bone of St. Anne).
Is it authentic? Is it really the arm of the mother of the Blessed Virgin?
I don't know. Although at the Basilica built over the grave of St. Paul, the relic is kept in a relic room that has no special signs or indication of the solemnity of these precious relics. Many people walk past, or merely pop their heads in for a moment before moving on, without ever realizing what it is they are looking at. Certainly it is not a room that is befitting the grandmother of our Lord. Still . . .