Some of the world’s most perplexing scientific discoveries have been found inside ancient caves.
They draw us because they are mysterious, and we wonder how deep they go.
They draw us back to our ancestry when shallow caves served as shelter, but deep caves also frighten us with their smothering darkness.
These caves contain ancient corpses, Neanderthal burial grounds, and even life-forms that are so old, they shock the archaeological community.
Some of these caves contain mysteries the likes of which science has yet to explain.
Here, we explore what the world of science has and has not yet understood in these cryptic depths.
Have a terrific weekend