 The two wings are supported by large bases that create a fortress-like structure, evocative of the large historic monuments that were constructed to last for an eternity, and to act as a symbols of preservation and guardianship of a collective memory.The building occupies an area of distributed over seven floors, with three floors used by technical rooms, reading rooms, an auditorium and exposition halls.The upper floors are used to shelter the shelves for documents, with austere cement walls, with small, square fenestrations, that characterizes a safe-box.