Grotte de la Mer de Glace

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Lonely Planet review

Since 1946, the Grotte de la Mer de Glace - an ice cave - has been carved every spring. Work begins in February and takes three months. The interior temperature is between -2°C and -5°C. Look down the slope for last year's cave to see how far the glacier has moved. Be prepared to climb 150 steps to access the cave.