Scientists have unearthed peculiar million-year-old rock tunnels in Africa, which have left researchers puzzled and suggest the existence of an ancient lifeform that has never been identified before.

Researchers have found a "unique" collection of "cave pearls"—some of which contain archaeological artifacts—in an ancient tunnel, a study has reported. Cave pearls are a type of "speleothem"—a term ...

Recent discoveries and research suggest the existence of massive underground tunnels that span across continents. These subterranean networks, both natural and man-made, have intrigued archaeologists ...