The geometry of the building responds directly to the urban condition of the site layout. The core of the plan is marked by a central void where there is a system of wide public stairs that connect the different levels and lead to the winter garden-like terrace on the last floor, which offers an overwhelming view of the castle and the city. A large dome of crossed metal beams is constructed over the ruins, freeing the space from any vertical structural elements. At the same time it creates a transparent platform that will provide clear views into the ruins from the surrounding streets as well as from the ground level of the library.
A structural facade is proposed to eliminate the need for any central vertical elements (pillars) – this allows the creation of large open areas in the center of the building. The structural facade rests on the dome podium in a natural flow of load bearing forces that are oriented towards the periphery.
Source: Inhabitat Architecture
Related links: CVDB Arquitectos