Barrel aging warehouse, or 'rickhouse'. Whiskey matures in these barrels until it reaches the age and flavor profile needed for one of Wild Turkey's products.
Barrel aging is enhanced by seasonal and daily temperature swings. Wild Turkey does rotate barrels between the top and bottom most floors if they are deemed to be aging too slow or fast.
The top rick on some floors is left empty, as seen here, to aid in even air flow.
The warehouses are not heated in winter and the sprinkler system contains antifreeze for the cold winter months.
From Wild Turkey with Master Distiller Jimmy Russell (April 2009)