(KCEN) -- The George W. Bush Library and Museum in Dallas has a treasure trove of artifacts from the September 11 terrorist attacks.
This year, visitors have the chance to see some documents and items that have never been on display before.
They include a block of granite from the World Trade Center.
Among the items always on display are a piece of twisted metal from the Twin Towers.
The Bush Library also had a minute-by-minute retelling of the former president's schedule on that tragic day.