'Outstanding' 2,200-year-old child's shoe discovered deep underground in Austrian mine

Archaeologists have made an "outstanding" discovery of a 2,200-year-old shoe in a rock-salt mine in Austria .

The shoe's design indicates that the footgear was crafted in the second century B.C. The discovery suggests that children were underground in the mines more than two millennia ago .

The museum has been carrying out archaeological work in the mine since 2001 .