Scientists continue to puzzle over the extensive, carefully engineered road system that Ancestral Puebloans built ten centuries ago in the San Juan Basin of the Colorado Plateau. What functions did this prehistoric road system serve, and what accounts for its quirky design features?

The impending change of rules that would allow national park visitors to arm themselves stands a good chance of being placed in limbo, if not overturned, by legal challenges in the coming weeks and months. But if that doesn't happen, it'll be interesting to see how many gun owners actually follow the rules.

Think of Capitol Reef National Park and, if you're familiar with this isolated outpost in Utah's canyon country, you'll likely envision soaring reefs of rock. But few would even imagine battles between mountain lions and lynx.

The pick of U.S. Senator Ken Salazar as the next Interior secretary is being labeled a failure by the Center for Biological Diversity. But the folks at The Wilderness Society say it's a great choice.