Located inside the historic Citadel Caverns just south of Atchison, KS. This facility was used the last 70 years as the World's Largest Military Bunker and storage site. The US Army has relinquished the facility and it is now open for public storage. ALL areas are climate (70Ã?Â°-75Ã?Â°) and humidity controlled. ALL areas also have lighting. Facility is very secure with perimeter fencing, security cameras, alarm systems, and steel exterior doors. Vehicles are allowed inside to deliver and pickup items from storage, however, there is a maximum door height of 9'6". Vehicles that will not fit into the facility may unload outside at our loading dock. Storage of hazardous, flammable or explosive items is not allowed. Vehicles, boats, or RVs should have their fuel tanks removed OR emptied to less than a quarter of a tank.