The citadel is a self contained village.
Of course they have the means of defense or to have the best fireworks around.
Of course these barrels are now empty but at one time it was someone's job to
move to be used in cannons/guns
Do you think they all contained gun powder?
Or maybe some wine?
The double walls helps protect the barrels and barrels of gunpowder.
What else is going on around the world?