A visitor's experience begins at the atrium of the museum's entry pavilion. Here, both the North and South memorial pools can be seen.
The Tridents are two 80-foot tall steel columns that once formed part of the exterior facade of the North Tower are the first artifact visitors see. Called "trees" by World Trade Center architect Minoru Yamasaki, 84 trident columns formed the perimeter structure of the first five stories of each of the Twin Towers.
International Flags are located in the atrium terrace level of the museum. Some of these flags are part of a collection of more than 180 United Nations member states that once hung from the mezzanine level of the original Twin Tower lobbies at the World Trade Center.