An aircraft monument for installation in an aircraft cabin including a first functional module, the first functional module including a side wall for delimiting the first functional module from a region of the aircraft cabin adjacent to the first functional module and/or from a region of the aircraft monument adjacent to the first functional module. The side wall is movable between a first and a second operational position and comprises a side-wall region which merely in the second operational position of the side wall serves for delimiting the first functional module from a region of the aircraft cabin adjacent to the first functional module, so that a movement of the side wall out of its first operational position into its second operational position results in an enlargement of a base area of the first functional module.