The event aims to encourage locals to appreciate the value of good architecture and urbanism, opening over 175 great buildings of different styles, forms and sizes to the public. The 48h Open House Barcelona program is built around the broad network of buildings that will open their doors to the public and it is set within the six Barcelona boroughs (Barcelona, Santa Coloma de Gramenet, Vilassar de Dalt, Sant Joan Despí, Badalona and L’Hospitalet de Llobregat).