The Materials Bank is a repository in which many decorative and building materials and various elements of the architecture of Porto are kept, which include tiles, plaster and cast iron, and it is as if the memories and identity of the streets of Porto have been collected in physical parts that the Bank collects, restores and preserves from the buildings Decaying or destroyed with the goal of eventually returning them to the city, the Materials Bank stores tens of thousands of tiles in its collection, nearly all of them available to building owners to take away free of charge to restore their facades.