As part of the 50th anniversary of the National Natural Landmarks Program this month, Secretary of the Interior Ken Salazar has designated Lake Shasta Caverns, a pristine cave in northern California, and Ice Mountain, an unusual geological phenomenon called glacière talus in West Virginia, as national natural landmarks.

Legislation that clears the way for the National Park Service to resume issuing permits for commercial horse pack trips in Sequoia and Kings Canyon national parks headed Friday to President Obama for his signature.

With sea turtles coming ashore at Biscayne National Park for nesting, officials are urging park visitors to keep their distance from turtles and any nests they see.

The Captain John Smith Chesapeake National Historic Trail, the country's first water trail, has grown with the addition of four watery connectors that extend into five states.