A lack of clues in the search for a missing hiker in Grand Canyon National Park has prompted a decision to begin scaling back the effort.

The National Trails System has grown by 525 miles thanks to the recent designation of 22 National Recreation Trails by Interior Secretary Ken Salazar. The trails, which range from boardwalks through coastal forests to corridors along rivers, can be found in 13 states.

George Washington may not have slept here, but he spent plenty of working hours in an 18th century building at Valley Forge National Historical Park now known as Washington's Headquarters. Following nearly seven months of restoration, the building is open again to the public.

The search for a missing hiker in Grand Canyon National Park has been narrowed down to an area in Hermit Basin, which is located west of Grand Canyon Village on the South Rim.