Let your students experience this voyage of discovery. The headquarters of the United Nations has served as the official headquarters of the United Nations since its completion in 1952. When you pass through the gates of the United Nations visitors’ entrance, you enter an international territory. This 18-acre site does not belong to just one country, but to all countries that have joined the Organization; to date the United Nations has 193 Member States. Your visit to the United Nations begins as you enter the Visitor’s entrance plaza, north of the General Assembly building, the edifice topped with a dome. On your way to the security screening, take a moment to look at the artwork lining the plaza. Each piece of art on the grounds and inside Headquarters has been donated to the United Nations by individual Member countries. Let your students experience this voyage of discovery.