Tourists walking in the ice grotto inside Rhone Glacier, Gletsch, Canton of Valais, Switzerland, Europe

Rhone Glacier Grotto, Switzerland

Mt. Mittelallalin, largest glacier cave in the world, Saas Fee, Valais, Switzerland, Europe

Natural ice cave in the Zinal Glacier, Zinal, Valais, Switzerland, Europe

Mt. Mittelallalin, largest glacier cave in the world, Saas Fee, Valais, Switzerland, Europe

Natural ice cave in the Zinal Glacier, Zinal, Valais, Switzerland, Europe

Largest glacier cave in the world, Mt. Mittelallalin, Saas Fee, Valais, Switzerland, Europe

Glacial cave in the Breidamerkurjoekull Glacier in Vatnajoekull National Park. europe, northern europe, iceland, February

Glacial cave in the Breidamerkurjoekull Glacier in Vatnajoekull National Park. Entrance to the Ice Cave europe, northern europe, iceland, February

Glacial cave in the Breidamerkurjoekull Glacier in Vatnajoekull National Park. Entrance to the Ice Cave europe, northern europe, iceland, February

Ice cave in the glacier Breidamerkurjoekull in Vatnajoekull National Park. Entrance to the Ice Cave. europe, northern europe, iceland, February

Ice cave in the glacier Breidamerkurjoekull in Vatnajoekull National Park. Tourists at the entrance to the Ice Cave. europe, northern europe, iceland, February

Ice cave in the glacier Breidamerkurjoekull in Vatnajoekull National Park. europe, northern europe, iceland, February

Glacial cave in the Breidamerkurjoekull Glacier in Vatnajoekull National Park. europe, northern europe, iceland, February