The National 9/11 Memorial & Museum is located at the former site of Ground Zero, the place where the Twin Towers of the World Trade Center once stood before the events of September 11, 2001, in which 2,996 people were killed. A somber site, the museum tells the story of the events of 9/11 and its aftermath, and the memorial offers visitors a chance to peacefully reflect on their experience. Visit with a guide who can point out the most significant details, or book a ticket in advance to ensure that you can enter the museum at your preferred time.