First lady Michelle Obama and her predecessor, Laura Bush, will speak on 9/11 near the United Flight 93 crash site in Pennsylvania. Will their united front help bring together a divided US?
On Saturday and Sunday, the National Park Service will not charge entrance fees at 146 national-park sites where visitors normally pay $3 to $25 for admission.
Jack Hanna said he's been carrying pepper spray on hikes for 15 years, but Saturday was the first time he's used it.
What the tragedy of the BP oil spill has taught us about regulations, technology, and how our energy diet must change.
So far, only the Gulf Coast National Seashore has seen oil on its barrier islands. But park officials from Louisiana for Florida's space coast are bracing for more oil.
Retired U.S. National Park Service workers formed Global Parks to share their expertise abroad.
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Precise lasers are being used to scan the four presidential faces of Mount Rushmore in an effort to record the measurements for historic documentation and preservation.