Morning Overview on MSN

Scientists uncover 2 terrifying extinct predators in world’s longest cave

Deep inside the world’s longest cave system, scientists have uncovered two terrifying extinct predators that once prowled a ...

From prehistoric sharks to unusual flowers: What’s inside the world’s largest cave

Mammoth Cave National Park, home to the world’s longest known cave system, stretches for more than 680 kilometres, and ...
Modern Engineering Marvels on MSN

Deep in Mammoth Cave, shark teeth rebuild a lost tropical sea

The longest mapped network of caves in the world also contains one of the most implausible marine collections in North America. In Mammoth Cave, sharks and their kinsmen are preserved in layers of ...
Travel + Leisure on MSN

This National Park Is Home to the Longest Cave in the World—and Only 426 Miles Have Been Explored So Far

Here’s how to plan a trip to Mammoth Cave National Park.