The outbreak of Covid-19 has suddenly jumped into our everyday life in the first part of 2020. Each of us inevitably has to face it without any chance to fight back. Our city has been turned into an empty space. People have to suffer from endless quarantine at home. Definitely, under this pandemic, numerous problems have been exposed. We realized how fragile our medical system and psychological health are. However, a series of reactions responding to the epidemic has also shown wisdom in an architectural way. Hospitals were built in ten days. Huge public buildings were transformed into temporary hospitals in order to treat patients. There are many more possibilities for hospitals today than in ancient times. This master thesis questions the classic principle "Form follows function" and imagines the future of hospitals. Starting from an experiment in Barcelona transforming four historical buildings into hospitals, the extra program is considered to be added to each hospital. The design part is mainly focused on one of the buildings, La Model. Preservation is architecture's saving retreat and we should make full use of it.