Investigators looking into a fire that destroyed 15 boats at a remote marina in Glen Canyon National Recreation Area haven't identified a cause of the blaze that generated $3-$5 million in damage to boats and dock facilities.

If the elk herd at Great Smoky Mountains National Park keeps growing like this, perhaps a gray wolf recovery program will be needed to keep the ungulates from over-grazing the park.

Dozens of historic riverfront buildings in St. Louis were demolished in the 1940s to make room for the Jefferson National Expansion Memorial. Boosters insisted that this was basically a matter of breaking a few eggs to make an omelet. Many preservationists think it was deplorable.

The National Park Service's parent agency, the U. S. Department of the Interior, recently completed a project with both literal and symbolic "green" benefits. Earlier this week, Secretary of the Interior Dirk Kempthorne helped unveil a "green roof" located on the 3rd wing of the Main Interior Building in Washington, D.C.