The blue Crystal Cave ice cave is illuminated by the evening sun in Svinafellsjokull in Skaftafell, Iceland. Picture: ORVAR ATLI THORGEIRSSON
Created by the forces of the Vatnajokull ice cap in the south of the volcanic island, the deep blue cave was formed by the glacier meeting the coastline.
The centuries-old ice has come from the slopes of 6,921 feet tall Oaefajokull, Iceland’s tallest active volcano.
The cave is accessible through a 22 foot entrance on the shoreline in Skaftafell national park.