1. A gaming system comprising: a plurality of gaming devices, each gaming device including: (i) a cabinet having a front and a back, (ii) a primary game display device supported by the cabinet, said primary game display device configured to display a primary game which is operable upon a wager, (iii) at least one input device supported by the cabinet, said at least one input device configured to enable a wager to be made on the primary game, and (iv) at least one processor operable to control the primary game; a plurality of spacer assemblies, each spacer assembly having a front and a back and configured to be positioned between two of the gaming device cabinets, said gaming device cabinets and said spacer assemblies configured to be positioned such that the backs of the cabinets and the backs of the spacer assemblies define an interior area; a mechanical symbol display assembly configured to be positioned in the interior area, said mechanical symbol display assembly operable to move at least one component to simultaneously display different bonus award symbols each in association with different ones of the gaming devices; and a multiple section dome-shaped see-through cover configured to be positioned over the mechanical symbol display assembly, said multiple section dome-shaped see-through cover including multiple sections at least partially connected by at least one connecting member extending between said sections.