The United States Geological Survey has started flying helicopters between 100 to 200 feet above the ground with a giant electromagnetic sensor ...

During the Cold War, the U.S. built a military base under the ice in Greenland, hidden from the Soviets. It was eventually abandoned, but its most lasting legacy is a pivotal role in climate science.

Federal Center in Lakewood faces an uncertain future as the Trump administration begins the process of consolidating or closing buildings used by the federal government.