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

Scientists working in an underground cavern between Greece and Albania have discovered the world’s largest spider web, according to a report in Subterranean Biology, and it's still crawling with ...

Divers in Mexico's Yucatan Peninsula say they have discovered the world's largest underwater cave. Underwater archaeologists discovered last week that the cave system known as Sac Actun, located near ...

The world’s longest underwater cave system now stretches an astonishing 524 Kilometers, a hidden labyrinth that, in raw ...

The web houses a colony of approximately 110,000 spiders from two different species Scientists have discovered the world’s largest spider web in an underwater cave on the border of Greece and Albania.

It dropped down to number two for a while, but more recent exploration confirms Mexico's Ox Bel Ha is officially the longest ...