Negotiating the South Rim of Grand Canyon National Park during the busy summer season can be a nightmare if you're trying to find a parking spot or crossing the road. With hopes of making it a bit easier this year, the National Park Service is implementing a free shuttle service from Tusayan to the South Rim.

With winter's killing fields still fresh in the memory, several hundred bison that had been held in a National Park Service "capture facility" were driven back into Yellowstone National Park on Monday. While the bison gained the relative safety of the park's landscape, nagging questions over their long-term management persisted.

As summer slowly approaches, more and more of Glacier National Park's landscape is becoming snow-free and accessible. Still, not all of the park's campgrounds will be open for the coming Memorial Day weekend.