Caves are pretty mysterious: not just to regular folks like us, but even to scientists. Any expert can tell us that when it comes to caves, it's not just an area or space under the surface of the Earth, in hillsides, or in cliff walls. Some of the time, caves are a complicated system of connected passageways, often like an underground maze! Other times?

It’s full of bizarre stuff like you’re about to see in these next clips. Hope you’re not afraid of the dark when you venture into the unknown… 15 Strangest Things Found In Caves!