Update: Explorer Ranulph Fiennes' epic challenge
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Update: Explorer Ranulph Fiennes' epic challenge

4 January 2017 Last updated at 17:21 GMT

British explorer Sir Ranulph Fiennes has started to climb the world's second highest mountain, Mount Aconcagua, in Argentina.

It's part of his record-breaking challenge to raise money for the charity Marie-Curie.

Mount Aconcagua is the highest mountain in South America, standing 6,959m high.

Check out the video to see which other mountains Sir Ranulph has left to conquer.