For centuries, humans have lived underground. Today, that ancient practice is under dire threat—even as cave life makes more ...

Fantasy stories spark our imaginations with enchanted forests, glowing caves, and castles in the clouds—but the real world ...

Berlin is worth visiting at any time of year for its history, arts and restaurant scene and infamous nightlife. But in summer ...

Vietnam is home to the world's largest cave. It's so vast that it has its own weather system and could fit an entire city ...

That’s exactly what happens at Indian Echo Caverns in Hummelstown, Pennsylvania – a subterranean wonderland that somehow remains one of the state’s best-kept secrets despite being, well, absolutely ...