Some of the most magnificent national parks of the Southwest owe their rugged beauty to the Colorado River and its tributaries. Unfortunately, dams that have sprung up along the river have changed the water flows in a way detrimental to these national parks, according to a report from the National Parks Conservation Association.

It's time to start a pool for those interested in guessing when key roads in Glacier, Rocky Mountain, and Yellowstone national parks will be open for summer traffic.

An avalanche in the middle of the night has killed a climber in Denali National Park.

Wisconsin's Apostle Islands National Lakeshore features picturesque islands, historic light stations, sandstone cliffs, sea caves, pristine beaches, old-growth forest, and abundant wildlife.