This is a bit niche, although I rarely let that stop me, but I rather liked this niche (I only realised what I’d done there when typing niche for a second time but I’m going to keep it) which is underneath the Bishop’s Throne at Norwich Cathedral.
This recess where the relics would have been piled up, with an information sign by this noting that “it was thought that the essence of these relics could rise up through the flue and give the Bishop divine aid and assistance” and that’s quite a nice thought. If you believed in the power of the relics, then this is a perfectly logical thing to do and I like that this hasn’t all been bricked up. These relics would have pulled out of here following the Reformation, so this has been empty for a long time now.
I understand that this isn’t a normal situation to have survived, not least as the Bishop’s Throne has usually been moved about the place in cathedrals. Although perhaps the ultimate place that this is replicated is the Chair of Saint Peter in St. Peter’s Basilica in Vatican City, where the chair is the actual relic.