Once enlightened, so to speak, the freed prisoner would not want to return to the cave to free "his fellow bondsmen". Plato argues that he must be persuaded or compelled to do so. Another problem lies in the other prisoners not wanting to be freed: descending back into the cave would require that the freed prisoner's eyes adjust again, and for a time, he would be one of the ones identifying shapes on the wall. His poor...
Mexico's Cave of Crystals stunned geologists when it was first discovered in 2000. The underground chamber contains some of the largest natural crystals ever found - some of the selenite structures have grown to more than 10m long.
The oldest example of a leather shoe has been discovered by archaeologists in a cave in Armenia. At 5,500 years old, the well preserved cow-hide shoe pre-dates Stonehenge by 400 years and the Pyramids of Giza by 1,000 years. It was made of a single piece of leather and was shaped to fit the wearer's foot, the researchers say.
They could be the earliest Christian writing in existence, surviving almost 2,000 years in a Jordanian cave. They could, just possibly, change our understanding of how Jesus was crucified and resurrected, and how Christianity was born.