Researchers discovered a hidden Antarctic landscape under a layer of ice over a mile thick that shows how different the continent looked millions of years ago

• Researchers recently found an "undiscovered landscape" beneath Antarctica's ice.
• The continent once looked very different and was much warmer. 
• Researchers are eager to learn more about Antarctica's past, especially since its ice is melting.

Millions of years ago, Antarctica looked very different. Instead of a mostly ice-covered continent, it was a landmass with free-flowing rivers and glacier-carved valleys.