But little did I know that just below me was an entire natural cave system waiting ... 1880s Ozark Mountain Village around the entrance to the cave. This is the start of what we know today as ...

With a depth of around 2,199 metres, a cave in Georgia is so deep that nearly seven Eiffel Towers could fit inside.

Near the chamber’s entrance, Mad Phil began drilling ... The sharp presidential profile is a natural feature of the limestone and one of the cave system’s many curiosities.

Why was this? Though Veryovkina Cave is the second deepest at a whopping 2,212m, its discovery was a complete accident. Let's ...

Prehistory - The earliest explorers of the cavern were indigenous peoples, and there are pictographs and mescal pits at the cave entrance. They didn't explore very far, due to the huge drop-off ...