In the evening after sunset the facade will become alive and show the guest the legend of how the citadel has been founded or just transformation in some another setting -- the land of Posseidon for instance.
To enhance guest's experience you may also use 3d mapping in interiors.
It can be full interior -- 3 or 4 walls for full immersive experience.
For example, this wall seems pretty good for such show.
We should not be limited by the interiors we have as table 3D mapping and interior 3d mapping can be easily organised in temporary tent constructions
Look, how we have changed tent construction in park-hotel in Suzdal