This isolated, elegant and sober building, which looks like an unassailable fortress, is the amazing convent school designed by Gaudí for a community of nuns from the Order of Saint Teresa of Jesus. This imposing building stands behind railings and among gardens, and has been used as a school ever since it opened.In 1887, a community of nuns from the Order of Saint Teresa of Jesus decided to build a school in Sant Gervasi de Cassoles, a village in the north of Barcelona. An unknown architect had already laid the foundation stone and established the floor plan of the building when Gaudí took over the project. He altered the actual structure of the building and left his own highly personal imprint on the ensemble.