Stunning pictures unveiled the inside of a mysterious and forgotten cave, which was thought to have secret healing powers. /VCG Photo

Holywell Cave, also known as St Cuthbert's Cave, was a once famous cave in Cornwall, southwestern England, in the UK, and many people used to travel to visit it. /VCG Photo

A natural spring was hidden down below the cavern where people could enter through steps carved in the rock at the entrance. /VCG Photo

Legend says that disabled people who drink the water from the spring would leave their crutches behind at the foot of the cave. /VCG Photo