A long-lost slab of Earth’s crust may be pulling away the bottom of the oldest part of North America, scientists say ...

Six Russian military aircraft were tracked operating in the Alaskan Air Defense Identification Zone for about 2 1/2 hours ...

From dormant volcanoes and salt pans to urban forests and library gardens, these are the places we go for peace and quiet.

The U.S. Army will take control of almost 110,000 acres of federal land along the U.S.-Mexico border to support Border Patrol operations.