world trade center

A man walks through the 9/11 Empty Sky memorial at sunrise across from New York's Lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, New Jersey.

Gary Hershorn/Reuters

A man walks through the 9/11 Empty Sky memorial at sunrise across from New York’s Lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, New Jersey.

Part of the World Trade Center stands inside the library as part of the tour that the public will be able to see on the day the George W. Bush Presidential Library opens for the first time to the public on the campus of Southern Methodist University in Dallas, Texas

Larry W Smith/EPA

Part of the World Trade Center stands inside the library as part of the tour that the public are able to see on the day the George W. Bush Presidential Library opens for the first time to the public on the campus of Southern Methodist University in Dallas, Texas.