A cold summer in Scotland has led to this incredible natural phenomenon - with ice and snow which still hasn't melted forming a network of icy tunnels and caves clinging to the edge of mountains.

Experts say an unusual mix of circumstances has produced a stunning world of snow tunnels and bridges towering higher than a double-decker buses in the Cairngorms National Park

A range of factors has seen a growing number of snow patches remaining since 2007, but this summer there are more than have been seen for 20 years.