The World's Largest Underwater Cave in Mexico is Filled With Ancient Mayan Treasures, Baffles Experts Explorers as a part of ...

courageous cave explorers discover new tunnels and rooms underground and thereby stretch the known limits of the world's longest and biggest cave systems. From the vast labyrinths in France to the ...

Sistema Sac Actun is the world’s largest underwater cave system. Stretching an astonishing 215 miles, this submerged labyrinth of tunnels, caverns, and crystal-clear waterways is not only a ...

Beneath the island’s rainforest, explorers search for new discoveries deep within some of the Earth’s largest, longest, and wildest caves. At dusk, a swarm of bats disperses to hunt in the ...

The Extremes crew had trekked for two days through steep valleys covered in lush jungle to reach Hang son Doong cave. Set deep inside Phong Nha-Ke Bang National Park, it is one of dozens of caves ...

the sound can be heard anywhere from within the cave system, which covers about 64 acres (260,000 square meters). That makes it the largest musical instrument in the world. We’ll save the ...

Škocjan Caves, the first Slovenian location inscribed on the Unesco World Heritage list, is considered the largest underground canyon in Europe. Inside it flows the Reka, the largest Slovenian ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?