With high carbon dioxide, low oxygen and no photosynthesis, here’s how an entire ecosystem persists in Movile Cave, one of the most extreme environments on Earth.

Deep in the rugged mountains of Papua, Indonesia, one of the most astonishing mining operations on Earth continues to shape ...

Formed over 20,000 years ago from the eruption of the Corona Volcano in northern Lanzarote, this impressive tube stretches ...

This massive underwater volcanic tunnel features lava caves, lakes, a concert hall, and a fascinating blend of subterranean ...

A rock formation in Minnesota has exposed some of the oldest rocks on the surface of the planet, and visiting it is a ...

Would Trump risk reducing the U.S. influence in the World Bank by decreasing its shareholding? Plus, a glimpse at the dark ...

I’m assuming it went through a legal department or other kind of review. They said, ‘You can have something inside the paper but you can’t do the wrap.’ We said thanks, no thanks because ...

sits half-buried inside Crystal Cave. Floyd Collins's grave sits in Mammoth Cave Baptist Church Cemetary. Mammoth Cave is known today as the largest cave system in the world, stretching over 400 ...

The Yellowhammer State didn’t earn the moniker Alabama the Beautiful for nothing. From white-sand beaches to majestic mountains, the state is overwhelming blessed with gorgeous scenery. Here are the ...

Yet one reminder remains of Collins’s postmortem treatment — a rusted iron box, about the size of a coffin, sits half-buried inside Crystal Cave. Mammoth Cave is known today as the largest cave system ...

In a statement on Saturday, Sinner said that the World Anti-Doping Agency (WADA ... But he is now Italy's biggest sports star after surging to the top of the sport ahead of Spain's golden boy ...