Valley Forge National Historical Park isn't the only unit of the national park system threatened by development on private lands that fall within its borders. Far from it. The latest case involves Virgin Islands National Park, where development on roughly 1,400 privately owned acres within the park's borders is harming the park's resources.

More than two centuries after General George Washington and his Continental Army somehow endured a bitterly cold and exacting winter at Valley Forge, the landscape is again in turmoil. On one side is a national historical park, one that helps preserve the memory of America's birth. On the other, an organization whose questionable motives could sully that landscape.

Four spelunkers who found themselves stranded in a cave in Great Smoky Mountains National Park were ill-prepared for their adventure.

A remote cluster of islands near Hawaii and George Washington's Virginia home, Mount Vernon, have been proposed by Interior Department officials for World Heritage Site designation.