Located deep inside Iceland's Vatnajökull glacier is a blue ice cave wonderland.
These caves are only accessible during certain times of the year. As the glacier shifts, it can reveal different access points to complex cave systems that are there for only a matter of weeks before the glacier changes again.
The Vatnajökull glacier is one of the largest in Europe and the caves, while breathtaking, are inaccessible without guides. Some of the caves can require hiking and climbing for nearly two hours.
Additional reporting by the Associated Press
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