1. I may be wrong but I think it's Durham cathedral ..from the romans ..on a statue ..Ely and Winchester have them but I have feeling that Durham is the oldest .
Prism: As I remember a prism can have an infinite number if sides
prism |?priz?m| noun Geometry a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.