Doors Open Canada is a national program by Heritage Canada, based on the Doors Open Days concept. It aims to expose architecture and heritage through the exploration of hidden historical, architectural and cultural gems. Buildings that are normally closed to the public, or which charge an entrance fee, welcome visitors to look around for free. The premiere Doors Open event in Canada, in age and repetition, is , which has run continuously since 2000. Since 2003, has been constantly growing, with new communities added each year.