Laser Mapping Reveals a Hidden Cavern the Size of Four Great Pyramids

In an age where every square mile of Earth's surface is so easily photographed and surveilled, to be a true explorer—to see what no human has ever seen before—one has to descend into the bowels of the Earth. Armed with high-tech lasers scanners, cavers are slowly mapping that underground world. And now they've found… »9/29/14 4:48pm

Step Inside The Historic Photo Archive Stored In an Underground Mine

Boyers, Pennsylvania, is home to the Iron Mountain storage facility, a former limestone mine that is now the storage site of more than 15 million photographic negatives and prints, all preserved hundreds of feet underground. This documentary, produced by the Hillman Photography Initiative, takes you inside for a… »4/29/14 12:22pm