The topic explored / designed / presented in this thesis has as its initial thought the way in which library buildings could exist today combined with the role that a botanical garden would have in the center of a city, with the peculiarity of placementof them under the ground. Libraries are first mentioned as the architectural realization of the shelter of knowledge and then their evolution is studied until today, where in theory they seem to be useless for the time due to the digitization of the cognitive material. Going back to the definition of botanical gardens, which makes them research and study centers, we are led to the idea that today the library can have the character of a Learning Center.The design takes place in Katerini, Pieria, a city made up of refugees and shows elements of diversity in its culture like no other provincial city in Greece. The plot of the following plot is simple and includes the perimeter layout of the building around the botanical garden, at an altitude of 7.20 meters below the ground, while scattered patios appear which will offer adequate contact of the building with the external environment.Finally, from the citation of the design proposal and operation, as well as the arguments in favor of the creation of the Apprenticeship Center, it appears that it will support and highlight the element of the city related to socializing and tolerance in the different.