Smithsonian National Museum of American History · Full chronicle and history

In September 2026, the National Museum of American History in the United States held a three-day special exhibition marking the 25th anniversary of the September 11 terrorist attacks, displaying 40 objects collected from the World Trade Center, the Pentagon, and the crash site in Pennsylvania, while staff and members of the public shared their personal stories and historical memories at the venue.

The Smithsonian National Museum of American History has assembled a 408kg time capsule, scheduled to be buried in Philadelphia on July 4 and opened in 2276.