The International Day for Monuments and Sites also known as World Heritage Day is an international observance held on 18 April each year around the world with different types of activities, including visits to monuments and heritage sites, conferences, round tables and newspaper articles.
Why World Heritage is so very important?? see various blog posts including World Heritage celebrates
What are “Monuments & Sites”…… The International Council on Monuments & Sites ICOMOS is The a professional association that works for the conservation and protection of cultural heritage places around the world.