The stone wall is from a 'bygone' age/era.
the 'bygone' days of our ancestors
(..) he can possess her and force her to wish Phoebe free. Here's the crystals you wanted. Well, you guys sure are chummy. Yeah, I had a change of heart. Decided to let bygones be bygones. Really? - There's something I have to tell you. - After we talk in the kitchen. - But-- - Phoebe. (..)2004 TvShow: Charmed Title: I Dream of Phoebe Season: 6 Episode 15