High Quality Content by WIKIPEDIA articles! European Heritage Days (EHD) is a joint action of the Council of Europe and the European Commission involving all 50 signatory states of the European Cultural Convention under the motto, Europe: a common heritage. The annual programme offers opportunities to visit buildings, monuments and sites, many of which are not normally accessible to the public. It aims to widen access and foster care for architectural and environmental heritage. These events are also known as Doors Open Days and Open Doors Days in English-speaking countries.